diff --git a/gui.js b/gui.js
index 921a98f..064c6d7 100644
--- a/gui.js
+++ b/gui.js
@@ -46,7 +46,7 @@ class FourDGUI {
 
 		this.gui.add(this.params, 'shape',
 			[ '5-cell', '16-cell', 'tesseract',
-				'24-cell', '600-cell', '120-cell' ]
+				'24-cell', '600-cell', '120-cell', 'dodecahedron' ]
 		).onChange(changeShape)
 		this.gui.add(this.params, 'inscribed').onChange(changeShape);
 		this.gui.add(this.params, 'inscribe_all').onChange(changeShape);
diff --git a/main.js b/main.js
index 3282f19..e04b485 100644
--- a/main.js
+++ b/main.js
@@ -64,6 +64,7 @@ const STRUCTURES = {
 	'16-cell': POLYTOPES.cell16(),
 	'tesseract': POLYTOPES.tesseract(),
 	'24-cell': POLYTOPES.cell24(),
+	'dodecahedron': POLYTOPES.dodecahedron(),
 	'120-cell': POLYTOPES.cell120(),
 	'600-cell': POLYTOPES.cell600(),
 };
diff --git a/polytopes.js b/polytopes.js
index 39736f0..3b35b85 100644
--- a/polytopes.js
+++ b/polytopes.js
@@ -668,3 +668,54 @@ const cell600_some_inscribed = (ps) => {
 export const cell600_inscribed = () => cell600_some_inscribed([1]);
 export const cell600_all_inscribed = () => cell600_some_inscribed([1,2,3,4,5]);
 
+
+
+function make_dodecahedron_vertices() {
+	const phi = 0.5 * (1 + Math.sqrt(5));  
+	const phiinv = 1 / phi;    
+
+	const nodes = [
+			{ x: 1, y: 1, z: 1, w: 0 },
+			{ x: 1, y: 1, z: -1, w: 0 },
+			{ x: 1, y: -1, z: 1, w: 0 },
+			{ x: 1, y: -1, z: -1, w: 0 },
+
+			{ x: -1, y: 1, z: 1, w: 0 },
+			{ x: -1, y: 1, z: -1, w: 0 },
+			{ x: -1, y: -1, z: 1, w: 0 },
+			{ x: -1, y: -1, z: -1, w: 0 },
+
+			{ x: 0, y: phi, z: phiinv, w: 0 },
+			{ x: 0, y: phi, z: -phiinv, w: 0 },
+			{ x: 0, y: -phi, z: phiinv, w: 0 },
+			{ x: 0, y: -phi, z: -phiinv, w: 0 },
+
+			{ x: phiinv, y: 0, z: phi, w: 0 },
+			{ x: phiinv, y: 0, z: -phi, w: 0 },
+			{ x: -phiinv, y: 0, z: phi, w: 0 },
+			{ x: -phiinv, y: 0, z: -phi, w: 0 },
+
+			{ x: phi, y: phiinv, z:0, w: 0 },
+			{ x: phi, y: -phiinv, z:0, w: 0 },
+			{ x: -phi, y: phiinv, z:0, w: 0 },
+			{ x: -phi, y: -phiinv, z:0, w: 0 },
+		];
+	index_nodes(nodes);;
+	return nodes;
+}
+
+export const dodecahedron = () => {
+	const nodes  = make_dodecahedron_vertices();
+	const links = auto_detect_edges(nodes, 3);
+
+	return {
+		nodes: nodes,
+		links: links,
+		geometry: {
+			node_size: 0.02,
+			link_size: 0.02
+		}
+	}
+}
+
+
diff --git a/testbed.js b/testbed.js
index c0633ab..7064d83 100644
--- a/testbed.js
+++ b/testbed.js
@@ -907,25 +907,43 @@ function check_120cell_nodes(nodes) {
 		}
 	});
 }
+
+function make_dodecahedron_vertices() {
+	const phi = 0.5 * (1 + Math.sqrt(5));  
+	const phiinv = 1 / phi;    
+
+	const nodes = [
+			{ x: 1, y: 1, z: 1, w: 0 },
+			{ x: 1, y: 1, z: -1, w: 0 },
+			{ x: 1, y: -1, z: 1, w: 0 },
+			{ x: 1, y: -1, z: -1, w: 0 },
+			{ x: -1, y: 1, z: 1, w: 0 },
+			{ x: -1, y: 1, z: -1, w: 0 },
+			{ x: -1, y: -1, z: 1, w: 0 },
+			{ x: -1, y: -1, z: -1, w: 0 }
+		].flat();
+	scale_nodes(nodes, 0.5);
+	return nodes;
+}
  
 
-const nodes = make_120cell_vertices();
-const links = auto_detect_edges(nodes, 4);
-const faces = auto_120cell_faces(links);
+// const nodes = make_120cell_vertices();
+// const links = auto_detect_edges(nodes, 4);
+// const faces = auto_120cell_faces(links);
 
 
-console.log("Calculating 120-cell colours")
+// console.log("Calculating 120-cell colours")
 
-const a2 = arctic_two(nodes, links, faces, faces[0], 341)
+// const a2 = arctic_two(nodes, links, faces, faces[0], 341)
 
-console.log(`got ${a2.dodecahedra.length}`);
+// console.log(`got ${a2.dodecahedra.length}`);
 
-const labels = a2.labels;
+// const labels = a2.labels;
 
-console.log("labelling nodes");
-for( const cstr in labels ) {
-	label_nodes(nodes, labels[cstr], Number(cstr));
-}
+// console.log("labelling nodes");
+// for( const cstr in labels ) {
+// 	label_nodes(nodes, labels[cstr], Number(cstr));
+// }