This is a fun series of Shapes with my peek-a-boo version of granny stitch. Gauge is not a big factor, as its all about the technique.
So any DK- light Aran weight yarn works with this.

Math is fun, and when you can incorporate it into creative space, it just is a super fun experience. This series is all about incorporating fun Math concepts into Crochet. Peek-a-boo series has a growing spiral from the center in all shapes.

This Triangular coaster/motif can be modified or joined to be made into placemats, buntings and many more fun projects.