Anamorphic quilts using optical or catoptric perspective
What is anamorphic perspective?
Artists can foreshorten and angle linear perspective to deform and change the scale of an object. The image becomes incomprehensible when viewed directly but resolves into a clear picture when looked at from a different vantage point.
There are two types of anamorphosis: optical, also known as direct or oblique; and catoptric.
Optical anamorphosis requires the viewer to look at a picture from an unusual angle instead of standing in front of the painting and looking at it straight on.
Catoptric anamorphosis requires the image to be seen reflected in a conical, cylindrical or pyramidal mirror.
Read more about anamorphic perspective.