Originally Posted by
Skhf
MI watched the video about tapered corners but I don't understand. What is the effect we are trying to get here?
A knife edge pillow will distort a bit because the center is fatter (can't think of another word) than the edges resulting in wrinkles or floppy ears. Tapering the corners is an upholsterer's trick to keep the pillow full all the way to the corners.