Laptops live on your lap; desktops live on your desk. Cell phones live on your hand but electronic tablets are awkwardly too big to live on your hand. Tablets generally can't stand up by it self on any surface, and when you try to use them on a couch, it ruins your posture.

Many people learned forwards while they focused into their work. As I learned from The Seatless, people don't use the back rest. I thought - instead of back rest - people needed chest rest to hold their posture at the right angle.

By giving the user the surface to lean against,  which limits how far they can lean forwards, the user can sit with a straight back and also focus on their work.

Two people who are working on a project together can share their ideas side by side.

In theory, sitting side by side with a stranger in a position you were never in before would be awkward and strange. But During the test, it proved not to be. When two strangers were sitting side by side, they were focused on what was right in front of them and seemed to not care about who they sat next to.