How to draw "Girdy"
  I was looking at a photo of the girders and beams on the roof of a sports complex. It dawned on me that there was a simple repetative pattern there that would make a good tangle. So here it is, step-by-step.
  1 Draw curves
2 Draw straight lines
  3 Fill in solid
4 Draw filler lines
An alternative for those who are obsessively precise
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