Who needs chairs? Who needs tables? Who needs "Sit up nice and straight"? It's a scientific fact that picture books perused while sinking into fluffy floor pillows are better reads than ones you open while in a stiff-back library chair.
Plus, cushions make snacks tastier and way more nutritious, and puzzles easier to solve. There would be published studies to back all this up if the researchers weren't so comfy lolling about on their laboratory floor.