They are just smaller mirrors (but not as small as the other developers!) and glued to the corners.
Smaller than the original mirrors, but not that much. In this way they are useful, smaller ones do not work.
Tested in the following game version: 1.41.x, 1.42.x and 1.43.x
Credits:
Miope
You can download the latest mods for this game by clicking here.
