What a cool quilt!! This was put together with Triangles and squares, not circles like it looks. The circled red triangle is the base, and the strips are put on either end, then 4 of these triangles are sewn together to make a square (circled in blue), once you put a bunch of these squares together you get that circular pattern. It's a great optical illusion, and is a classic spider web quilt!! it is very stunning and you are lucky to own it.
Cheers!
Rachel