Most cabinets incorporate a apical of some sort. In legion cases, the foremost is merely to enclose the compartments within and serves no other purpose - as in a wall hung cupboard for example. In other cabinets, the top also serves as a work surface - a kitchen countertop for example.
The languid susan, a shelf which rotates around a central axis, allowing available means stored at the Bath Storage Cabinets rearward of the cabinet to be brought to the ventral by rotating the shelf. These are ordinarily accustomed in corner cabinets, which are immortal and deeper and have a greater "dead space" at the back than other cabinets.