I think it would be nice to have one-way walls for our condos.
Right now it is possible to create a one-way passageway
as shown in this video
but I believe it would be nice to have an item for this so we can do it on a large scale without having to look at a ceiling fan in the wall as shown in this bug.
You can walk through the wall one way,
while you get blocked on the other.
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These can be used in conjunction with one-way wall textures as well (where one side is invisible and the other is a specified texture OR you can use a texture gun to specify textures for the 6 different sides of the wall).
One-way doors could also be useful (doors that open from one side only). You can use a timer (with Condo/IO) to close the door automatically as well.