In the past few years, we have covered plenty of cool optical illusion toys and gadgets here. This Black Hole Optical Illusion Rug is also worth a look. It has patterns of white and black to create the illusion of a bottomless hole. You can order it in 5 sizes from 40x60cm to 80x160cm.
This optical illusion rug is 0.8cm thick. You can find out more about it here.