The hole in glass and grating does not allow the player to press buttons or manipulate objects. It would be nice to be able to accentuate the fact that pressing a button or manipulating a cube on the other side of grating is intended. That seems like the best use for the hole in grating, but it actually PREVENTS the player from being able to press the button or manipulate objects:

https://youtu.be/ENnNz4g1pBU