Three right angled triangles are all that is needed to create one of these Flying Geese units (or patches.) The largest triangle piece is considered to be the "geese" piece -- (why it is not called a "goose" piece is beyond me). The other two identical triangles are considered to be the "sky" pieces.
Flying geese units are probably the third most commonly used patches in quiltmaking -- following the square and the half square triangle.
Free Quilt Block Pattern
The Fan Waves was a new quilt block to me. I am not even sure this is the correct name for this block, but I liked it.
This quilt block features half square triangles in two different sizes, as well as quarter square triangles (which become the "goose" part of the flying geese unit). When you put it all together, you see a pinwheel (or a fan) in the centre of a star. All in all a good use of different patches, which results in a wonderful learning experience.
The sample quilts illustrated give you ideas of how to make a quilt that is totally different than your "neighbour", if you happen to be using this block in quilt class. Enjoy!