diff --git a/chord_diagram.go b/chord_diagram.go
new file mode 100644
index 0000000..b6979b7
--- /dev/null
+++ b/chord_diagram.go
@@ -0,0 +1,159 @@
+package mujica
+
+import (
+	"math"
+
+	"github.com/egoist/mygo/ui"
+
+	"mujicaui/internal"
+	"mujicaui/theme"
+)
+
+// ChordDiagramOptions configure a ChordDiagram.
+type ChordDiagramOptions struct {
+	Frame  ChartFrame
+	Format func(v float64) string
+}
+
+// chordLayout is each group's arc and each pair's chord ends, as angles.
+type chordLayout struct {
+	arcs  [][2]float64
+	sub   [][][2]float64
+	pairs [][2]int
+	total float64
+}
+
+// chordGap is the angle left between group arcs.
+const chordGap = 0.04
+
+func chordPlace(matrix [][]float64) chordLayout {
+	n := len(matrix)
+	l := chordLayout{arcs: make([][2]float64, n), sub: make([][][2]float64, n)}
+	sums := make([]float64, n)
+	for i, row := range matrix {
+		if len(row) != n {
+			panic("mujica: ChordDiagram matrix must be square")
+		}
+		for j, v := range row {
+			if v < 0 || math.IsNaN(v) || math.IsInf(v, 0) {
+				panic("mujica: ChordDiagram values must be finite and ≥ 0")
+			}
+			sums[i] += v
+			if j > i && v+matrix[j][i] > 0 {
+				l.pairs = append(l.pairs, [2]int{i, j})
+			}
+		}
+		l.total += sums[i]
+	}
+	if l.total == 0 {
+		return l
+	}
+	span := 2*math.Pi - chordGap*float64(n)
+	a := 0.0
+	for i := range n {
+		l.arcs[i] = [2]float64{a, a + span*sums[i]/l.total}
+		l.sub[i] = make([][2]float64, n)
+		at := a
+		for j := range n {
+			w := span * matrix[i][j] / l.total
+			l.sub[i][j] = [2]float64{at, at + w}
+			at += w
+		}
+		a = l.arcs[i][1] + chordGap
+	}
+	return l
+}
+
+// ChordDiagram joins group arcs by chords; reading a group highlights them.
+func ChordDiagram(c *ui.Context, names []string, matrix [][]float64, opts ChordDiagramOptions) ChartResult {
+	if len(names) != len(matrix) {
+		panic("mujica: ChordDiagram needs a name per matrix row")
+	}
+	ch := newChart(c, opts.Frame)
+	l := chartMemo(ch, "chords", chartID(matrix), func() chordLayout { return chordPlace(matrix) })
+	k := Tokens(c)
+	pal := internal.Palette(k)
+	size := FontSize(c, theme.CaptionSize)
+	val := func(v float64) string { return chartValue(c, v, opts.Format) }
+	n := len(names) + len(l.pairs)
+	if l.total == 0 {
+		n = 0
+	}
+	geom := func(r ui.Rect) (cx, cy, rad float32) {
+		return r.X + r.W/2, r.Y + r.H/2, min(r.W, r.H)/2 - 30
+	}
+	spec := ChartSpec{Marks: n}
+	spec.Readout = func(i int) string {
+		if i < len(names) {
+			out, in := 0.0, 0.0
+			for j := range names {
+				out += matrix[i][j]
+				in += matrix[j][i]
+			}
+			return names[i] + " · " + msg(c, "chord_diagram.out") + " " + val(out) + " · " + msg(c, "chord_diagram.in") + " " + val(in)
+		}
+		p := l.pairs[i-len(names)]
+		return names[p[0]] + " → " + names[p[1]] + " " + val(matrix[p[0]][p[1]]) + " · " + names[p[1]] + " → " + names[p[0]] + " " + val(matrix[p[1]][p[0]])
+	}
+	spec.Pick = func(r ui.Rect, x, y float32) int {
+		cx, cy, rad := geom(r)
+		d := float32(math.Hypot(float64(x-cx), float64(y-cy)))
+		a := math.Atan2(float64(x-cx), float64(cy-y))
+		if a < 0 {
+			a += 2 * math.Pi
+		}
+		if d >= rad-2 && d <= rad+14 {
+			for i, arc := range l.arcs {
+				if a >= arc[0] && a < arc[1] {
+					return i
+				}
+			}
+		}
+		return -1
+	}
+	spec.Draw = func(p *ui.Painter, r ui.Rect, active int) {
+		cx, cy, rad := geom(r)
+		lit := func(pair [2]int) bool {
+			switch {
+			case active < 0:
+				return true
+			case active < len(names):
+				return pair[0] == active || pair[1] == active
+			}
+			return l.pairs[active-len(names)] == pair
+		}
+		for pi, pair := range l.pairs {
+			i, j := pair[0], pair[1]
+			s, t := l.sub[i][j], l.sub[j][i]
+			var path ui.Path
+			internal.Arc(&path, cx, cy, rad, s[0], s[1], true)
+			tx, ty := internal.Polar(cx, cy, rad, t[0])
+			path.QuadTo(cx, cy, tx, ty)
+			internal.Arc(&path, cx, cy, rad, t[0], t[1], false)
+			sx, sy := internal.Polar(cx, cy, rad, s[0])
+			path.QuadTo(cx, cy, sx, sy).Close()
+			alpha := float32(0.45)
+			if !lit(pair) {
+				alpha = 0.08
+			}
+			p.FillPath(&path, pal[i%len(pal)].Alpha(alpha))
+			if active == len(names)+pi {
+				p.StrokePath(&path, 1.5, k.Text)
+			}
+		}
+		for i, arc := range l.arcs {
+			grow := float32(0)
+			if i == active {
+				grow = 4
+			}
+			p.FillPath(internal.Sector(cx, cy, rad+2, rad+12+grow, arc[0], arc[1]), pal[i%len(pal)])
+			if arc[1]-arc[0] > 0.15 {
+				lx, ly := internal.Polar(cx, cy, rad+20, (arc[0]+arc[1])/2)
+				ax := 0.5 - 0.5*float32(math.Sin((arc[0]+arc[1])/2))
+				chartText(p, names[i], lx, ly, size, k.Text, ax, 0.5+0.5*float32(math.Cos((arc[0]+arc[1])/2)))
+			}
+		}
+	}
+	res, _ := ch.build(spec)
+	return res
+}
diff --git a/chord_diagram_test.go b/chord_diagram_test.go
new file mode 100644
index 0000000..e513e1d
--- /dev/null
+++ b/chord_diagram_test.go
@@ -0,0 +1,72 @@
+package mujica
+
+import (
+	"math"
+	"testing"
+
+	"github.com/egoist/mygo/ui"
+)
+
+var chordNames = []string{"Nave", "Choir", "Crypt", "Cloister"}
+var chordMatrix = [][]float64{{0, 5, 2, 3}, {4, 0, 1, 0}, {1, 2, 0, 6}, {2, 0, 3, 0}}
+
+func TestChordPlace(t *testing.T) {
+	l := chordPlace(chordMatrix)
+	if l.total != 29 || len(l.pairs) != 5 {
+		t.Fatalf("total %v pairs %v", l.total, l.pairs)
+	}
+	span := 2*math.Pi - 4*chordGap
+	if got := l.arcs[0][1] - l.arcs[0][0]; math.Abs(got-span*10/29) > 1e-9 {
+		t.Fatalf("Nave arc %v", got)
+	}
+	if l.sub[0][1][1]-l.sub[0][1][0] <= 0 || l.sub[1][3][1] != l.sub[1][3][0] {
+		t.Fatal("sub-arcs not sized by the matrix")
+	}
+}
+
+func TestChordDiagramReadout(t *testing.T) {
+	h := &chartHarness{build: func(c *ui.Context) ChartResult {
+		return ChordDiagram(c, chordNames, chordMatrix, ChordDiagramOptions{Frame: ChartFrame{Label: "Paths"}})
+	}}
+	tt := ui.NewTester(h.view, 520, 420)
+	tabTo(t, tt, "Paths")
+	tt.Key(0, ui.KeyRight)
+	if got := chartReadout(tt); got != "Nave · out 10 · in 7" {
+		t.Fatalf("group %q", got)
+	}
+	tt.Key(0, ui.KeyEnd)
+	if got := chartReadout(tt); got != "Crypt → Cloister 6 · Cloister → Crypt 3" {
+		t.Fatalf("chord %q", got)
+	}
+	tt.Key(0, ui.KeyEscape)
+	b := h.res.Element.Bounds()
+	cx, cy, rad := b.X+b.W/2, b.Y+120, float32(240)/2-30
+	tt.Move(cx+(rad+6)*0.5, cy-(rad+6)*0.866) // 30°: inside the first arc
+	if h.res.Point != 0 {
+		t.Fatalf("hover %d", h.res.Point)
+	}
+}
+
+func TestChordDiagramBad(t *testing.T) {
+	for name, m := range map[string][][]float64{"ragged": {{1, 2}, {1}}, "negative": {{0, -1}, {1, 0}}} {
+		func() {
+			defer func() {
+				if recover() == nil {
+					t.Errorf("%s: no panic", name)
+				}
+			}()
+			ui.NewTester(func(c *ui.Context) {
+				Use(c, Settings{})
+				ChordDiagram(c, []string{"a", "b"}, m, ChordDiagramOptions{Frame: ChartFrame{Label: "x"}})
+			}, 300, 300)
+		}()
+	}
+}
+
+func TestChordDiagramSnapshot(t *testing.T) {
+	snapshot(t, "chord_diagram", 520, 340, func(c *ui.Context) {
+		ui.Column(c).Padding(16).Children(func() {
+			ChordDiagram(c, chordNames, chordMatrix, ChordDiagramOptions{Frame: ChartFrame{Label: "Paths"}})
+		})
+	})
+}
diff --git a/messages_charts2.go b/messages_charts2.go
index aa8fced..bc2e4d9 100644
--- a/messages_charts2.go
+++ b/messages_charts2.go
@@ -2,11 +2,14 @@ package mujica
 
 func init() {
 	addMessages(map[string][2]string{
-		"chart_legend.more":   {"+%d more", "另有 %d 项"},
-		"chart_legend.fewer":  {"Show fewer", "收起"},
-		"chart_brush.window":  {"%s: %s to %s", "%s：%s 至 %s"},
-		"chart_brush.start":   {"Range start %s", "区间起点 %s"},
-		"chart_brush.end":     {"Range end %s", "区间终点 %s"},
-		"violin_plot.readout": {"%s · median %s · quartiles %s–%s · %d values", "%s · 中位数 %s · 四分位 %s–%s · %d 个值"},
+		"chart_legend.more":             {"+%d more", "另有 %d 项"},
+		"chart_legend.fewer":            {"Show fewer", "收起"},
+		"chart_brush.window":            {"%s: %s to %s", "%s：%s 至 %s"},
+		"chart_brush.start":             {"Range start %s", "区间起点 %s"},
+		"chart_brush.end":               {"Range end %s", "区间终点 %s"},
+		"violin_plot.readout":           {"%s · median %s · quartiles %s–%s · %d values", "%s · 中位数 %s · 四分位 %s–%s · %d 个值"},
+		"parallel_coordinates.filtered": {"filtered out", "已筛除"},
+		"chord_diagram.out":             {"out", "流出"},
+		"chord_diagram.in":              {"in", "流入"},
 	})
 }
diff --git a/parallel_coordinates.go b/parallel_coordinates.go
new file mode 100644
index 0000000..6381b05
--- /dev/null
+++ b/parallel_coordinates.go
@@ -0,0 +1,196 @@
+package mujica
+
+import (
+	"log/slog"
+	"maps"
+	"math"
+	"strings"
+
+	"github.com/egoist/mygo/ui"
+
+	"mujicaui/internal"
+	"mujicaui/theme"
+)
+
+// ParallelCoordinatesOptions configure a ParallelCoordinates chart.
+type ParallelCoordinatesOptions struct {
+	Frame ChartFrame
+	// Names labels each row in the readout; nil uses the row number.
+	Names  []string
+	Format func(v float64) string
+}
+
+// pcDrag is a brush being dragged on one axis.
+type pcDrag struct {
+	axis   int
+	y0, y1 float32
+}
+
+// ParallelCoordinates draws rows across parallel axes; dragging an axis filters.
+func ParallelCoordinates(c *ui.Context, filters *map[string][2]float64, axes []string, rows [][]float64, opts ParallelCoordinatesOptions) ChartResult {
+	if filters == nil || len(axes) < 2 || opts.Names != nil && len(opts.Names) != len(rows) {
+		panic("mujica: ParallelCoordinates needs filters, two or more axes and a name per row")
+	}
+	for _, r := range rows {
+		if len(r) != len(axes) {
+			panic("mujica: ParallelCoordinates rows need one value per axis")
+		}
+	}
+	ch := newChart(c, opts.Frame)
+	k := Tokens(c)
+	size := FontSize(c, theme.CaptionSize)
+	ink := internal.Palette(k)[0]
+	type scales struct{ lo, hi []float64 }
+	sc := chartMemo(ch, "scales", chartID(rows), func() scales {
+		s := scales{lo: make([]float64, len(axes)), hi: make([]float64, len(axes))}
+		for a := range axes {
+			lo, hi := math.Inf(1), math.Inf(-1)
+			for _, r := range rows {
+				if !math.IsNaN(r[a]) {
+					lo, hi = min(lo, r[a]), max(hi, r[a])
+				}
+			}
+			if math.IsInf(lo, 1) {
+				lo, hi = 0, 1
+			}
+			s.lo[a], s.hi[a], _ = internal.Nice(lo, hi, 4)
+		}
+		return s
+	})
+	keep := func(r []float64) bool {
+		for a, name := range axes {
+			if f, ok := (*filters)[name]; ok && (math.IsNaN(r[a]) || r[a] < f[0] || r[a] > f[1]) {
+				return false
+			}
+		}
+		return true
+	}
+	geom := func(r ui.Rect) (ui.Rect, func(a int) float32, func(a int, v float64) float32) {
+		plot := ui.Rect{X: r.X + 36, Y: r.Y + 24, W: r.W - 72, H: r.H - 32}
+		ax := func(a int) float32 { return plot.X + plot.W*float32(a)/float32(len(axes)-1) }
+		y := func(a int, v float64) float32 {
+			return plot.Y + plot.H*float32(1-(v-sc.lo[a])/(sc.hi[a]-sc.lo[a]))
+		}
+		return plot, ax, y
+	}
+	name := func(i int) string {
+		if opts.Names != nil {
+			return opts.Names[i]
+		}
+		return "#" + chartValue(c, float64(i+1), nil)
+	}
+	spec := ChartSpec{Marks: len(rows)}
+	spec.Readout = func(i int) string {
+		parts := []string{name(i)}
+		for a, n := range axes {
+			parts = append(parts, n+" "+chartValue(c, rows[i][a], opts.Format))
+		}
+		if !keep(rows[i]) {
+			parts = append(parts, msg(c, "parallel_coordinates.filtered"))
+		}
+		return strings.Join(parts, " · ")
+	}
+	spec.Pick = func(r ui.Rect, x, y float32) int {
+		_, ax, ys := geom(r)
+		best, dist := -1, float32(8)
+		for i, row := range rows {
+			for a := 0; a+1 < len(axes); a++ {
+				x0, x1 := ax(a), ax(a+1)
+				if x < x0 || x > x1 || math.IsNaN(row[a]) || math.IsNaN(row[a+1]) {
+					continue
+				}
+				t := (x - x0) / (x1 - x0)
+				if d := abs32(ys(a, row[a]) + t*(ys(a+1, row[a+1])-ys(a, row[a])) - y); d < dist {
+					best, dist = i, d
+				}
+			}
+		}
+		return best
+	}
+	drag := ui.Local(ch.res.Element, "mujica.pc.drag", func() pcDrag { return pcDrag{axis: -1} })
+	spec.Input = func(plot *ui.Element, r ui.Rect) {
+		box, ax, _ := geom(r)
+		px, py, _ := plot.PointerPosition()
+		_, _, held := plot.Dragged()
+		switch {
+		case held && drag.axis < 0:
+			for a := range axes {
+				if abs32(px-ax(a)) <= 12 {
+					*drag = pcDrag{axis: a, y0: py, y1: py}
+				}
+			}
+		case held:
+			drag.y1 = max(box.Y, min(box.Y+box.H, py))
+		case drag.axis >= 0:
+			a := drag.axis
+			m := maps.Clone(*filters)
+			if m == nil {
+				m = map[string][2]float64{}
+			}
+			if abs32(drag.y1-drag.y0) < 4 {
+				delete(m, axes[a])
+			} else {
+				v := func(y float32) float64 {
+					return sc.lo[a] + float64((box.Y+box.H-y)/box.H)*(sc.hi[a]-sc.lo[a])
+				}
+				m[axes[a]] = [2]float64{min(v(drag.y0), v(drag.y1)), max(v(drag.y0), v(drag.y1))}
+			}
+			*filters, ch.res.value = m, true
+			*drag = pcDrag{axis: -1}
+			slog.Debug("mujica: parallel_coordinates brush", "axis", axes[a], "filters", len(m))
+		}
+	}
+	shownDrag := *drag
+	spec.Draw = func(p *ui.Painter, r ui.Rect, active int) {
+		plot, ax, ys := geom(r)
+		line := func(row []float64, w float32, col ui.Color) {
+			var path ui.Path
+			started := false
+			for a := range axes {
+				if math.IsNaN(row[a]) {
+					started = false
+					continue
+				}
+				x, y := ax(a), ys(a, row[a])
+				if started {
+					path.LineTo(x, y)
+				} else {
+					path.MoveTo(x, y)
+				}
+				started = true
+			}
+			p.StrokePath(&path, w, col)
+		}
+		for _, row := range rows {
+			if !keep(row) {
+				line(row, 1, k.Border)
+			}
+		}
+		for _, row := range rows {
+			if keep(row) {
+				line(row, 1.25, ink.Alpha(0.6))
+			}
+		}
+		if active >= 0 {
+			line(rows[active], 3, k.Text)
+		}
+		for a, n := range axes {
+			x := internal.Snap(p, ax(a))
+			p.Line(x, plot.Y, x, plot.Y+plot.H, 1.5, k.ControlBorder)
+			if f, ok := (*filters)[n]; ok {
+				y0, y1 := max(plot.Y, ys(a, f[1])), min(plot.Y+plot.H, ys(a, f[0]))
+				p.Fill(ui.Rect{X: x - 6, Y: y0, W: 12, H: max(y1-y0, 1)}, k.Selection, 2)
+				p.Stroke(ui.Rect{X: x - 6, Y: y0, W: 12, H: max(y1-y0, 1)}, k.AccentText, 2, 1.5)
+			}
+			chartText(p, n, x, plot.Y-8, size, k.Text, 0.5, 1)
+			chartText(p, internal.FormatTick(sc.hi[a], (sc.hi[a]-sc.lo[a])/4), x+10, plot.Y, size, k.TextMuted, 0, 0)
+			chartText(p, internal.FormatTick(sc.lo[a], (sc.hi[a]-sc.lo[a])/4), x+10, plot.Y+plot.H, size, k.TextMuted, 0, 1)
+		}
+		if shownDrag.axis >= 0 {
+			x := ax(shownDrag.axis)
+			p.Stroke(ui.Rect{X: x - 6, Y: min(shownDrag.y0, shownDrag.y1), W: 12, H: abs32(shownDrag.y1 - shownDrag.y0)}, k.AccentText, 2, 1.5)
+		}
+	}
+	res, _ := ch.build(spec)
+	return res
+}
diff --git a/parallel_coordinates_test.go b/parallel_coordinates_test.go
new file mode 100644
index 0000000..fbb1a32
--- /dev/null
+++ b/parallel_coordinates_test.go
@@ -0,0 +1,84 @@
+package mujica
+
+import (
+	"math"
+	"testing"
+
+	"github.com/egoist/mygo/ui"
+)
+
+var pcAxes = []string{"Age", "Hymns", "Vigils"}
+var pcRows = [][]float64{{20, 3, 9}, {35, 8, 2}, {50, 5, 5}, {65, 1, math.NaN()}}
+var pcNames = []string{"Agnès", "Clare", "Hild", "Bede"}
+
+func TestParallelCoordinatesReadoutAndBrush(t *testing.T) {
+	filters := map[string][2]float64{}
+	values := 0
+	h := &chartHarness{build: func(c *ui.Context) ChartResult {
+		r := ParallelCoordinates(c, &filters, pcAxes, pcRows, ParallelCoordinatesOptions{Frame: ChartFrame{Label: "Monks"}, Names: pcNames})
+		if r.ValueChanged() {
+			values++
+		}
+		return r
+	}}
+	tt := ui.NewTester(h.view, 520, 420)
+	tabTo(t, tt, "Monks")
+	tt.Key(0, ui.KeyEnd)
+	if got := chartReadout(tt); got != "Bede · Age 65 · Hymns 1 · Vigils no value" {
+		t.Fatalf("readout %q", got)
+	}
+	b := h.res.Element.Bounds()
+	plot := ui.Rect{X: b.X + 36, Y: b.Y + 24, W: b.W - 72, H: 240 - 32}
+	// Age runs 20..80 on the first axis: brush 30..55.
+	y := func(v float32) float32 { return plot.Y + plot.H*(1-(v-20)/60) }
+	tt.Press(plot.X, y(55))
+	tt.Move(plot.X, y(40))
+	tt.Move(plot.X, y(30))
+	tt.Release(plot.X, y(30))
+	f, ok := filters["Age"]
+	if !ok || math.Abs(f[0]-30) > 0.5 || math.Abs(f[1]-55) > 0.5 || values != 1 {
+		t.Fatalf("brush %v %v (%d)", f, ok, values)
+	}
+	tt.Key(0, ui.KeyHome)
+	if got := chartReadout(tt); got != "Agnès · Age 20 · Hymns 3 · Vigils 9 · filtered out" {
+		t.Fatalf("filtered readout %q", got)
+	}
+	tt.Press(plot.X, y(45)) // a click on the axis clears it
+	tt.Release(plot.X, y(45))
+	if _, ok := filters["Age"]; ok {
+		t.Fatal("click did not clear the brush")
+	}
+}
+
+func TestParallelCoordinatesHoverAndBad(t *testing.T) {
+	filters := map[string][2]float64{}
+	h := &chartHarness{build: func(c *ui.Context) ChartResult {
+		return ParallelCoordinates(c, &filters, pcAxes, pcRows, ParallelCoordinatesOptions{Frame: ChartFrame{Label: "Monks"}})
+	}}
+	tt := ui.NewTester(h.view, 520, 420)
+	b := h.res.Element.Bounds()
+	plot := ui.Rect{X: b.X + 36, Y: b.Y + 24, W: b.W - 72, H: 240 - 32}
+	// A quarter into the first gap, row 2 (Age 50 of 20..80, Hymns 5 of 0..8) is 0.53 up.
+	tt.Move(plot.X+plot.W/8, plot.Y+plot.H*(1-0.53125))
+	if h.res.Point != 2 {
+		t.Fatalf("hover picked %d", h.res.Point)
+	}
+	defer func() {
+		if recover() == nil {
+			t.Fatal("no panic for a short row")
+		}
+	}()
+	ui.NewTester(func(c *ui.Context) {
+		Use(c, Settings{})
+		ParallelCoordinates(c, &filters, pcAxes, [][]float64{{1}}, ParallelCoordinatesOptions{Frame: ChartFrame{Label: "x"}})
+	}, 300, 300)
+}
+
+func TestParallelCoordinatesSnapshot(t *testing.T) {
+	snapshot(t, "parallel_coordinates", 520, 320, func(c *ui.Context) {
+		filters := map[string][2]float64{"Hymns": {2, 9}}
+		ui.Column(c).Padding(16).Children(func() {
+			ParallelCoordinates(c, &filters, pcAxes, pcRows, ParallelCoordinatesOptions{Frame: ChartFrame{Label: "Monks"}, Names: pcNames})
+		})
+	})
+}
diff --git a/testdata/snapshots/darwin/chord_diagram-dark.png b/testdata/snapshots/darwin/chord_diagram-dark.png
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diff --git a/testdata/snapshots/darwin/chord_diagram-light.png b/testdata/snapshots/darwin/chord_diagram-light.png
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diff --git a/testdata/snapshots/darwin/parallel_coordinates-dark.png b/testdata/snapshots/darwin/parallel_coordinates-dark.png
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diff --git a/testdata/snapshots/darwin/parallel_coordinates-light.png b/testdata/snapshots/darwin/parallel_coordinates-light.png
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