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 Rachel Minis
by S. Menachery
by CourtneysCreations YT
by Hardanger Embroidery
by The Tutorial Kid
by INDIAN Culture
by Growing Craft