These blocks are available as patterns on craftsy , as is the quilt setting pattern.
background foreground illusion
Do you see the white crossor the black zig zags?
The cafe wall illusion
Do the lines veer up or down?
Does the shape appear to be 3 dimensional?
Does it move towards you or away from you?
Could you really make it?
Do you see the white lattice or the black and grey shapes?
Do the black and grey shapes appear to move?
available on Craftsy
Five illusions Quilt setting