The Accu-Quilt Go people have a new die for their cutting machines: Carpenter's Wheel. They asked me for a little pattern history. I found several variations in The Encyclopedia of Pieced Quilt Patterns and BlockBase+, different arrangements of diamond shapes and triangles---and triangles combined into squares.
But watch the whole thing. Pam and Erica will show you how efficiently the Carpenter's Wheel die will cut the pattern.