My design is a cabinet can also be used as a stair. The principleis that the cabinet can be expanding as a stair by rotating each layer, and the angle is adjustable. It helps saving the interior spaces as a cuboid and the materials. There is a door hinge in each step which connects two walls and makes it easy to rotate. I add an additional wall on the last step in order to support the whole structure.
tranSTUDIO 2021 
natalie+suyang+luna:
– transformative GIF and the indication of colors helps understand how the pieces will move
– missing assembly GIF; showing what hardware will be used for those connections
– add figure scale
– consider adding another hinge, and maybe a larger one?
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