This illustration from Alex Eckman-Lawn shows the interior of an O’Neill cylinder habitat. If you’re unfamiliar with how these large space habitats works, it might seem confusing, but it’s actually pretty fascinating. The hab is a hollow cylinder, sort of like a soda can, spun along its long axis. This provides gravity to the human settlements that are on the interior, on the curving walls. On the inside, there is no horizon because the walls rise up on either side above you, meeting overhead. Parts of the cylinder are windows, allowing solar light into the interior as it rotates. The interior landscape would be sculpted, allowing for “rural” recreational areas and crop growth in addition to urban settlements