[math-fun] Puzzle: In Julian's inverted gasket

http://gosper.org/Inverted%20Sierpinski%20Triangle%20thick.png some triangles are biconvex and some biconcave, and some hard to tell. Are there any straight arcs? --rwg

Apropos lines and circles, Tatiana Shubin requests the status of the restricted Anning's(?)

problem: How many points can lie in a plane with no three in a line nor four in a circle? Last she heard, it was up to 7 or 8.