Ideas of questionable quality

[Recusor]

What do you need to do for it?

Not sure I understand the question or if my first post was unclear; my initial idea to make this was to have a normal window, and then you could apply a beaker of silver to one side. This mimics in a very lowtech fashion the idea of silvered or halfsilvered windows. This depends on the tile your character is on. If you are on to the tile to the right of the window and apply the silver there, then that side is the one that blocks vision from the upper right, right, and bottom right tile.

If the question is why do I want this; to make secret labs or to create tactical advantages by allowing vision for one person while restricting it for the other