I dreamt this last night:

I'm around my old school, which is conjoined with a cloister. On top of the roof I see a car, but that's one thing that's impossible, cars can't get on that roof. The next moment I'm on the roof myself and I see more cars, but no driveway to get on or off the roof...

Suddenly I'm in a big room with lots of dark wood against the walls. I realize my mission is to find a triangular block of wood and take it somewhere. I don't know where to find it but then I see a model of the building on the windowsill. I pick it up and find the triangular block in some hall which leads to the room I'm in. I take a screwdriver and break it loose from the model, I tilt the whole thing and I hear it rumble and roll through the hallway until it ends up in the room. Then a door opens and someone asks if it worked.

The end.

yes, i believe my dreams have also contained triangles which at the time had great significance
possibly in relation to my own hand, my dream was a triangle shaped book from argos book store in east town.