Turbo mode (SHIFT+FLAG) green flag Select the slider "n" and press the spacebar!
At each vertex of the octagon is drawn smaller octagon. The resulting octagons repeat this step. similar: http://scratch.mit.edu/projects/leszpio/2785093 http://scratch.mit.edu/projects/leszpio/2774047 http://scratch.mit.edu/projects/leszpio/2765565