And here it is in apl :) (width iterations) ← 127 64 ⍝ perfect size for a nice sierpinski advance ← {2|-⌿¯1 1⊖⍤0 1⊢⍵} ⍝ on a torus x←width⍴0 ⋄ x[⌊widt

And here it is in apl :) (width iterations) ← 127 64 ⍝ perfect size for a nice sierpinski advance ← {2|-⌿¯1 1⊖⍤0 1⊢⍵} ⍝ on a torus x←width⍴0 ⋄ x[⌊width÷2] ← 1 {⎕←' ⌹'[⍵]⋄advance ⍵}⍣iterations⊢x And the random variant (not as pretty, but still has some nice triangles): {⎕←' ⌹'[⍵]⋄advance ⍵}⍣iterations ?width⍴2