The Right and Left Quilt Block is aptly named. Each corner of the Right and Left Quilt Block has a lighter valued piece on the right and a darker valued piece on the left.
The visual effect when you group multiples of the Right and Left Quilt Block together is quite striking. Many pinwheels appear where the blocks connect.
The illustration below shows construction that follows the 2x2 grid. It is also possible to construct this block using just one square in the center, eliminating four seams.