Folding and cutting spheres. Awesome symmetry balls include card constructions by George Hart, which you can learn about here (and others are on ... ): ... and the Gardner Ball by Oskar van Deventer with design by Scott
by iHasCupquake
by innerchildfunmedia
by Let's Knit Y'all
by LionBrandYarn
by Scribble
by WFN: World Fishing Network
by Maricita Colours in English