A cubicle is an area of a room that has been partitioned from the rest of a larger room. A cubicle will have walls, not necessarily a door, and generally, no ceiling. If you look at cubicle pictures, you'll see that the most common use for cubicles in 21st century is to partition desks in large open-planned offices. The most traditional cubicles are those found in public toilets and changing rooms. Cubicles tend to not be part of the fabric of a building but add-on fixtures once the structure is habitable.
This means in theory, that the layout of cubicle structures can change as other needs change. If you search our thousands of stock photos, images and vectors, you will see that cubicle pictures are very geometric and uniform. What may appear at first mundane, actually shows beauty in conformity.