( It is not really an optical illusion ) click for a new pattern. press m for a black-and-white pattern. space to toggle editing. ( you cannot change pattern or save while editing ) s to save, l to load. colour 101 is black, 102 is white. 18-2-118-102-0.72- is my favourite pattern. If you do not type in a valid code, it will give you nonsense.
all code by me Scratch for pen extension
