Not quite sure where to categorize this furniture because it is simply not a chair, nor a lounge nor a daybed, nor something you add to make your mattress comfortable.

This is designed from polyurethane foam covered with textile (removable) and comes with no basic structure from the inside. But the base is made of plywood.

It was launched in the late 60’s. At that time, this was considered quite revolutionary.

Via Design Bloom