Infinity - (Cardboard-) Building Corner Safety Clip

A simple corner piece for your cardboard Infinity buildings.

With four of those (one on each corner) you can build up a second or third floor that isn't going to fail on you.

There is also an extra variant of the clip, with an additional space for 15x2mm magnets.
Those can be used to attach displays to the building, as produced by different companies.

Those clips fit in with the standard.