A fun bit of history. The first fully enclosed prototype for what eventually became Hiptop/Sidekick was a project-box-y critter called Paperback (roughly the size of a trade paperback book). https://mastodon.social/media/cUmIkU-QmZ9L1awtJCM https://mastodon.social/media/xZ3O-poJHiV-6G_Bo0s
Later, the Navi prototypes provided devices that were roughly the form factor we were aiming for, but did not include the hinge mechanism. https://mastodon.social/media/Mj_wIz_FnAcWQYwbgQs https://mastodon.social/media/M5V4rhDXgJg9v7If6Ic