This is a perfect example of the superposition principle since you are seeing several reinforced slabs in the making. You can see the reinforcement steel for a foundation slab in the middle and the reinforcement steel around is for a foundation slab of a wall.

Superposition principle is one of the most important things since you can break down any issue in smaller ones to find a simple solution to each part, and then, add all of the solutions to have a compound solution. It works in engineering and in life.