Points of Departure was a progression from Surface Tension. Both rely on distortion to create the effect.
Shapes which can be fitted together to cover a flat surface are called tessellations.
Using several shapes the same, four-
With knitting and crochet, normal geometric rules can be ignored because the pieces will distort to look like something they are not.
These circles are fun because, even without the distortion of joining them together
in a strange way, they are not flat. Each one has a little dome in the middle. The
afghan reminds m a bit of bubble-
The pattern includes instructions for making some other domed shapes that will also fit together to create an interesting surface.