How about a Mandelbrot set ASCII art?
mandelbrot =: (+ *:)`]@.(2&<@:|@:])^:12 ]
grid=:|:@:(j./~@:(i.--:))
a. {~ 33+31| >. | mandelbrot"(0)25%~grid 100
> From: [email protected]
> To: [email protected]
> Date: Thu, 13 Aug 2015 10:06:02 -0400
> Subject: [Jprogramming] ascii art
>
> quad tree:
>
> (2 2$<@])^:4 i.0 0
>
> Sierpinki square:
>
> (<@[ (<1;1)} 3 3$<@])^:3~ i.0 0
>
>
>
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