Originally Posted by JANW
it doesn't look the same with the small white tip on the second one. I must be dense.
Your block is a 2 1/2" strip sewn to a 6 1/2" rectangle. This makes a square. Then you cut it on the diagonal. One triangle has a small white tip and the other one has white edge along one side. When you sew the white tipped triangles together you get the pinwheel effect.