A leaning ladder bookcase must be leaned against a wall or solid structure in order to stay up. The top of the bookcase is usually designed to rest squarely against the wall, and the feet of the bookcase will often feature some sort of rubber footing or other material to prevent the legs from sliding.

How do you make tiered shelves?

Tiered Shelf- DIY Instructions
Step 1: Place the shelf ends flat on the table. Make sure that the grooves are facing upward. Step 2: Next, take one shelf and line up both grooves. Step 3: Repeat this pattern for all three shelves and you will notice the shelf is on it’s back.