Bit board
This is the development stage of a story about a horizontal-growing cube who has to fight the inhabitants that do not horizontally in a tight cubical space inside a world that cubes are meant to grow vertically to both be able to view the outside world and occupy just the right amount of space. In the end, their world starts expanding as the cube grows more and more horizontally resulting in a definite survival for everyone and a door for new experiences in the new world.