diff --git a/engine-proto/ganja-test/ganja-test.html b/engine-proto/ganja-test/ganja-test.html
new file mode 100644
index 0000000..f1ecf45
--- /dev/null
+++ b/engine-proto/ganja-test/ganja-test.html
@@ -0,0 +1,51 @@
+<!DOCTYPE html>
+<html>
+<head>
+ <style>
+ body {
+ background-color: #ffe0f0;
+ }
+
+ /* needed to keep Ganja canvas from blowing up */
+ canvas {
+ min-width: 600px;
+ max-width: 600px;
+ min-height: 600px;
+ max-height: 600px;
+ }
+ </style>
+ <script src="https://unpkg.com/ganja.js"></script>
+</head>
+<body>
+ <script>
+ // the "points spheres plane" example from the Ganja coffee shop
+ //
+ // https://enkimute.github.io/ganja.js/examples/coffeeshop.html#cga3d_points_spheres_planes
+ //
+
+ // Create a Clifford Algebra with 4,1 metric for 3D CGA.
+ Algebra(4,1,()=>{
+ // We start by defining a null basis, and upcasting for points
+ var ni = 1e4+1e5, no = .5e5-.5e4;
+ var up = (x)=> no + x + .5*x*x*ni;
+
+ // Next we'll define 4 points
+ var p1 = up(1e1), p2 = up(1e2), p3 = up(-1e3), p4 = up(-1e2);
+
+ // The outer product can be used to construct the sphere through
+ // any four points.
+ var s = ()=>p1^p2^p3^p4;
+
+ // The outer product between any three points and infinity is a plane.
+ var p = ()=>p1^p2^p3^ni;
+
+ // Graph the items.
+ document.body.appendChild(this.graph([
+ 0x00FF0000, p1, "p1", p2, "p2", p3, "p3", p4, "p4", // points
+ 0xE0008800, p, "p", // plane
+ 0xE00000FF, s, "s" // sphere
+ ], {conformal: true, gl: true, grid: true}));
+ });
+ </script>
+</body>
+</html>
diff --git a/engine-proto/ganja-test/ganja-test.jl b/engine-proto/ganja-test/ganja-test.jl
new file mode 100644
index 0000000..ea8b334
--- /dev/null
+++ b/engine-proto/ganja-test/ganja-test.jl
@@ -0,0 +1,71 @@
+using Blink
+import Blink: JSString
+
+# === styling utility ===
+
+style!(w, stylesheet) = @js win begin
+ @var style = document.createElement("style");
+ style.appendChild(document.createTextNode($stylesheet));
+ document.head.appendChild(style);
+end
+
+# === page source ===
+
+stylesheet = """
+body {
+ background-color: #ffe0f0;
+}
+
+/* needed to keep Ganja canvas from blowing up */
+canvas {
+ min-width: 600px;
+ max-width: 600px;
+ min-height: 600px;
+ max-height: 600px;
+}
+"""
+
+# the "points spheres plane" example from the Ganja coffee shop
+#
+# https://enkimute.github.io/ganja.js/examples/coffeeshop.html#cga3d_points_spheres_planes
+#
+sphere_example = """
+Algebra(4, 1, ()=>{
+ // We start by defining a null basis, and upcasting for points
+ var ni = 1e4+1e5, no = .5e5-.5e4;
+ var up = (x)=> no + x + .5*x*x*ni;
+
+ // Next we'll define 4 points
+ var p1 = up(1e1), p2 = up(1e2), p3 = up(-1e3), p4 = up(-1e2);
+
+ // The outer product can be used to construct the sphere through
+ // any four points.
+ var s = ()=>p1^p2^p3^p4;
+
+ // The outer product between any three points and infinity is a plane.
+ var p = ()=>p1^p2^p3^ni;
+
+ // Graph the items.
+ document.body.appendChild(this.graph([
+ 0x00FF0000, p1, "p1", p2, "p2", p3, "p3", p4, "p4", // points
+ 0xE0008800, p, "p", // plane
+ 0xE00000FF, s, "s" // sphere
+ ], {conformal: true, gl: true, grid: true}));
+});
+"""
+
+# === page construction ===
+
+# create window and open developer console
+win = Window()
+opentools(win)
+
+# set stylesheet
+style!(win, stylesheet)
+
+# load Ganja.js
+loadjs!(win, "https://unpkg.com/ganja.js")
+
+# launch Ganja visualization
+body!(win, "", async=false)
+js(win, JSString(sphere_example))