[friedegg]

I had the same thought. This would be the sort of weird game mechanic the could introduce in a Portal 3.

[cam_l]

Like this?[0]

(Valve had a prequel for portal planned before portal 2 with a very similar idea)

Edit: but not nearly as cool as this demo.

[0]https://thenerdstash.com/an-inside-look-at-valves-abandoned-...