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 Black Hole is an easy block for construction, as it has only one quilt patch to learn -- the flying geese patch.
This quilt block is also part of the category uneven nine patch as it is constructed just the same as a nine patch, but all of the units are not the same size.
This time, I have shown four different quilt layouts in the samples illustrated, just so you know that a simple block does not mean that your quilt will be boring. Enjoy!