Step 1

Create a new document in Adobe Illustrator and draw a hexagon like in the next picture using Polygon Tool in the Tools Tab:

Step 2

Duplicate the polygon (CTRL+ENTER) and repeat the step until you obtain the below result. (Colorized the polygons like this):

Step 3

Select all the polygons, right click and choose Group:

Step 4

Now draw a circle (using Ellipse Tool in the Tools Tab) and duplicate it:

Step 5

Select the polygons and apply the next effect: Effects > Distort & Transform > Pucker & Bloat with the next settings:

Step 6

Select the polygons and the red circle, right click and choose Make Clipping Mask:

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