Seemingly normal hallway, but in this spot, with the right briefcase-device you can cause two dimensions to intersect. It is almost like looking in the mirror however there are entities which can exist only in one at the same time. For them going from one dimension to another is possible, while the others cannot achieve this. It's like pushing your finger at your reflection - the harder you push, the harder the reflection is pushing at you. You make step to the right, reflection is making step to it's left. Something makes your reflection to fall over, you also fall over... as long as the intersection is opened.

This particular map caused so much trouble. End result is more foggy than I would like to, but it's best I could get.

Rendered in Source 2 Filmmaker, anthros by   petruz