立體圖形反射對稱 https://www.youtube.com/watch?v=5ExS1cXLqKc
立體圖形旋轉對稱 https://www.youtube.com/watch?v=bXO7NTlft5Y
正方體的反射對稱 https://www.geogebra.org/m/WKGKdnJ6
正方體的旋轉對稱 https://www.geogebra.org/m/cwp6k7KD
摺出正四面體 Paper folding of tetrahedron https://www.youtube.com/watch?v=Hicrcqu0i3M