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diff --git a/2019/sketch_190928a/sketch_190928a.pyde b/2019/sketch_190928a/sketch_190928a.pyde
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+++ b/2019/sketch_190928a/sketch_190928a.pyde
@@ -0,0 +1,27 @@
+def setup():
+    size(512, 512)
+    noLoop()
+    rectMode(CENTER)
+    colorMode(HSB)
+    noStroke()
+
+def draw():
+    clear()
+    grade(256, 256, 4, 512)
+
+def grade(xo, yo, n, tw):
+    cw = tw / n
+    offset = (cw - tw) / 2
+    for i in range(n):
+        x = xo + offset + cw * i
+        for j in range(n):
+            y =  yo + offset + cw * j
+            if cw > 4 and random(10) < 8.5:
+                grade(x, y, 2, cw)
+            else:
+                fill((i*64 + j*64) % 256, 200, 200)
+                square(x, y, cw)
+
+def keyPressed():
+    saveFrame("####.png")
+    redraw()