http://raa.ruby-lang.org/list.rhtml?name=supershape
A Belgian Biologist named Johan Gielis discovered a formula
that can create a vast diversity of natural shapes. By tweaking
four parameters it can produce everything from simple triangles
and pentagons, to stars, spirals and petals.
ってことで，Maths gets into shape や SuperShapes を見るとなかなか面白い図形ができる．
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