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I am trying to reproduce a poster I found, but I don't know exactly how to reproduce these concentric red lines inside the black circle.

enter image description here

I tried to use spirals but it didn't quite do the work. I could draw one by one but I am sure there is a better way!

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This is an interesting question because there are several ways this could be done. Here's another method, using only three paths.

  1. Drop a horizontal and vertical guide to give you a centre origin. Lock the guides.

  2. Draw a circle centred on the origin, then fill it with purple, add a red stroke.

  3. Using the Arc Tool - draw a single arc that fits to the edge of the circle, stroke red, no fill. Then click Object > Arrange > Send to Back

  4. Using the centre origin again, draw a black circle, no fill, thick black stroke.

  5. Then group everything.

Example set up

  1. Now, open the Appearance panel, and click on the fx button, and click Distort & Transform > Transform

  2. Set the rotation angle to 45, copies to 7, enable the preview option to see it. Click OK to accept.

Example of applying transform

  • Very interesting, I loved this solution! It's probably the one I am going to use – Stefano Pesce Jul 5 '17 at 14:00
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enter image description here

  1. Draw an ellipse

  2. Duplicate it (= drag horizontally holding Alt) Have the Smart Quides ON to be easily able to move only horizontally

3-4. Take the direct selection tool and delete 2 anchor points from each. Group the remaining quarters to keep them together.

  1. Goto Object > Transform > Rotate, -45 degrees, Copy

  2. Repeat 2 times by pressing Ctrl+D

  3. This is optional (no image) Goto Object > Transform > Reflect > Vertical if you want to change the apparent rotational direction.

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    In step 2, you don't need smart guides if you hold Alt and Shift. Shift will constrain to horizontal, vertical, or 45 degree diagonals. – Wildcard Jul 4 '17 at 23:23
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    @Wildcard OK, marked the comment =useful. – user287001 Jul 4 '17 at 23:27
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    Also smart guides do not necceserily imply alignment guides as you can separately turn those off. (i do since they interfere with accurate drawing in certain cases) – joojaa Jul 5 '17 at 4:10

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