Any maps using the void/HOM?

Any maps out there noteworthy that used "the void" or the "HOM effect" in any way for effects? I've always wondered if a mapper ever exploited it for any bizarre reason. I've seen some maps mess up on nodebuilding (mostly huge slige maps) that have huge void chunks out of walls and corners.

Wow.wad -Illusio pit!

In this room from Requiem MAP03 the ceiling kinda looks like it is sloped thanks to the missing textures.

Doom2 map25


I've seen some other wads use it intentionally (I assume) but I can't remember their names. tom19 map32 requires you to go in the void.

I use this effect in the void maps of my globaldeath project. Its useful for consealing parts of the map that would seem to be empty space, only to be revealed as a temple once you access a certain point of the map.

I think I saw it used on Scythe MAP22. Not overly sure what the effect was supposed to be though. :/