This is an old design but it was cool so I redrew it in inkscape. Read about it here. http://en.wikipedia.org/wiki/Penrose_triangle 펜로즈 삼각형 레드 펜로즈 삼각형 RGB
An example of a necker cube and an Impossible cube (one arm runs across the other but is still straight, which can't happen in 3D; it's an optical illusion). 큐브 necker 큐브 착시 Necker 큐브 및 불가능 한 큐브
Three gears in an impossible (or at least immovable) arrangement. Done in Inkscape. 기어 컬러 만화 불가능 한 기어