I was looking at this interesting album art

How do I get to this concentric effect on a shape that is non-circular? I tried to draw the triangle and his center point, and then adjust the anchor points to the external shape and to the center point. I am kind of getting there, but the process is tedious and the result doesn't look so appealing:

Is there some feature, like transform and distort, that would help me achieve a better result?


  • You can cut the lines after they ahve been created
    – joojaa
    Commented Aug 21, 2017 at 9:13
  • Make the spokes in a radius and clip them into a triangle.
    – Webster
    Commented Aug 22, 2017 at 0:10

1 Answer 1


It may not be the most efficient if you have a lot of points to transform but you could start with a dashed stroke on your outer object, expand the stroke, select all the inner points then use the Scale Tool to scale those inner points:

enter image description here

Which gives us this:

enter image description here

  • Awesome. I wonder how you guys come up with these solutions, that after they have been shown look quite obvious, but before they are not immediate to me. Thank you! Commented Aug 21, 2017 at 9:42
  • 1
    @StefanoPesce We spend quite many hours of our waking time pondering about geometrical issues.
    – joojaa
    Commented Aug 21, 2017 at 10:13

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