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 NightHawkInLight
by World Of Amigurumi
by Garnstudio DROPS Design
by Paperfold Oriart
by easy rangoli
by Sugan's Rangoli designs
by ALL ART TIPS