Drag the triangle or move the sliders to rotate the triangle. Click the flag to reset it.
This is a 3D model of the Penrose triangle (AKA the impossible triangle), and it is impossible to have a connected shape like this in real life. It was first drawn in 1934 by a Swedish artist named Oscar Reutersvärd. Here's the 3D engine I used (also made by me): https://scratch.mit.edu/projects/423351254/