Imitation windows

[Fytayn]

It's even better than that: when you select the false window, or any wall-placed item, from your storage you can move the mouse/stick to have the placement outline where you want it and then hit the context menu key/button (Numpad[*] on PC) once to bring up the menu and again to select Place. As long as the middle of the object (the space between the placement arrows) is on a vertical surface it will place -- even if the outline colour indicates otherwise**.

This works for floor-placed items, too, allowing you to put things on stairs and landings as well as much closer (or even inside) objects that block placement like wall pillars or the front steps! Just make sure the middle of the object is on a valid surface!

When you select an object from storage, right after choosing it from the list but before moving/rotating it, the context menu button can place it. Because that initial placement only checks the middle of the object you can place objects much closer to walls/pillars/barriers if you come at them from the side.

** As Kidria said it can end up "nudged" slightly off the desired placement. Wall-placed items snap to walls/partitions so placing one on a pillar means it will be inside the pillar, snapped to the wall, after placing; any rotation caused by the curve of surfaces like pillars will be preserved when snapped to the wall. Changes in placement sometimes only resolve when the Housing UI is closed completely. ...Please consult your doctor to see if placement glitching is right for you xD