Legos for big boys

Across the street the hospital is building a new parkade (parking garage). It’s pretty cool watching it go up because it’s all pre-fab slabs and columns. I’m sure whoever came up with this concept spent a lot of time playing with Legos or something.
There’s no forms to build and no concrete to pour. A couple of times a day this big flatbed truck loaded up with large concrete slabs or pillars will back in to the site. A crane will hoist the pieces up and place them into position and then they get attached together in some fashion. And presto, there you have it, one instant wall, or instant floor/ceiling beam. Very nifty.
I think the outer brick layer must be fashioned in a similar way because one day there was just plain old concrete slab, and then the next day there was brick all over the outside.