Nine Patch Uneven Nine Patch
The Uneven Nine Patch style of quilt block is so named because not all of the nine individual patches are the same size as is the case in a regular nine patch quilt block. This style of quilt block is often used in 10" quilt block to make the math easier, but you will find this construction method in many other quilt blocks as well.

Plaited Block

Free Quilt Block Pattern

The Plaited Block is another example of an optical illusion design. It is comprised of simple patches that give the impression of twists and turns once placed next to another block.

This eight patch block is constructed in "chunks" (as I like to call them) and then sewn together as an uneven nine patch. Using only squares, rectangles and half square triangles, you will produce an intriguing design when the blocks are placed in a quilt.

Check out other "optical illusion" blocks:
~ Folded Corners
~ Formal Frame
~ Garden Square
~ Interlocking Chain
~ Ribbon Star
~ Twisted Ribbon