Another eclectic fractal is this impossible 3D triangular one which seems somehow connected to sheaf cohomology. [Tweet.](https://twitter.com/johncarlosbaez/st

Another eclectic fractal is this impossible 3D triangular one which seems somehow connected to sheaf cohomology. [Tweet.](https://twitter.com/johncarlosbaez/status/1109491970534187008 https://twitter.com/johncarlosbaez/status/110949197053418700...) [Wikipedia German.](https://commons.wikimedia.org/wiki/File:Penrose_meets_sierpinski-level5.svg https://commons.wikimedia.org/wiki/File:Penrose_meets_sierpi...)