With red-blue 3D glasses you see this shape coming out of the screen towards you. Put on red-blue glasses, Click flag. Click screen. Move mouse to see cube's perspective change as 3D "anaglyph."
Connects corners to three vanishing points.Shows three-point perspective, as in drawing.Corners follow mouse position. Pen follows corners. Pen draws in one color, shifts the whole perspective and draws in the other color. I found the best colors are cyan (aqua blue-green) and a orangish yellow, at least with my glasses and screen, red lens on left eye, blue lens on right eye. This type of 3D is called anaglyph. Based on my more basic 3 point persective Scratch program.
