@bit101 looks interesting you cover egg and heart shapes. I once ported some spiro code did you look at raph revin's latest rust stuff on curves? I suspect that it would be too expensive for a paper back release, I just like to read books away from a computer screen and don't have funds for special tablets. Can imagine that is impossible for self publish but thought I would leave the question incase it blows up so big it becomes viable... which it probably will! Still have some making move books as2 and as3.