Anti-parabola propoganda, plus musing on math class, cardioids, connect the dots, envelopes of lines, even a bit of origami. Another way to get a cardioid is to add up circles like this: ... Extra poin
by Macrame School
by C for Craft
by FASION CREATION
by World Of Amigurumi
by Dots DIY
by Southern Charm Wreaths
by Yarnspirations