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diff --git a/s168/s168.pyde b/s168/s168.pyde
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+# Alexandre B A Villares - https://abav.lugaralgum.com / sketch - a - day
+SKETCH_NAME = "s167"  # 180615
+
+add_library('peasycam')
+
+boxes, lines, walls = [], [], []
+
+def setup():
+    global space
+    size(600, 600, P3D)
+    hint(DISABLE_DEPTH_TEST)
+    strokeWeight(2)
+    # noSmooth()
+    cam = PeasyCam(this, 100)
+    cam.setMinimumDistance(100)
+    cam.setMaximumDistance(1000)
+    grid_dim = 10
+    space = width / grid_dim
+    for ix in range(grid_dim):
+        for iy in range(grid_dim):
+            for iz in range(grid_dim):
+                x = space / 2 + ix * space - width / 2 + random(2)
+                y = space / 2 + iy * space - width / 2 + random(2)
+                z = space / 2 + iz * space - width / 2  # + random(-2, 2)
+                boxes.append(PVector(x, y, z))
+    for p in boxes:
+        for op in boxes:
+            if p != op:
+                stroke(200, 0, 100)
+                if (dist(p.x, p.y, p.z,
+                         op.x, op.y, op.z) < space * 1):
+                    lines.append((p, op))
+    for (p1, p2) in lines:
+        for (p3, p4) in lines:
+            if p1 != p3 and p1 != p4 and p2 != p3 and p2 != p4:
+                if p1.z == p2.z and p3.z == p4.z and p1.z != p3.z:
+                    if (dist(p1.x, p1.y, p1.z, p3.x, p3.y, p3.z) < space + 3 and
+                            dist(p2.x, p2.y, p2.z, p4.x, p4.y, p4.z) < space + 3):
+
+                        walls.append((p1, p2, p3, p4))
+
+    println(len(walls))
+
+
+def draw():
+    background(200)
+
+    for w in walls:
+        p1, p2, p3, p4 = w
+        fill(100, 0, 200, 10)
+        noStroke()
+        beginShape()
+        vertex(p1.x, p1.y, p1.z)
+        vertex(p2.x, p2.y, p2.z)
+        vertex(p4.x, p4.y, p4.z)
+        vertex(p3.x, p3.y, p3.z)
+        endShape(CLOSE)
+
+    for (p, op) in lines:
+        stroke(200, 0, 100)
+        line(p.x, p.y, p.z, op.x, op.y, op.z)
+
+    for p in boxes:
+        pushMatrix()
+        translate(p.x, p.y, p.z)
+        fill(0)
+        noStroke()
+        box(2)
+        popMatrix()