Unity (aesthetics) in the context of "Form (architecture)"

In aesthetics, "unity in variety" (sometimes "unity in diversity") is a principle declaring that in art beauty can come from the variety of diverse components grouped together thus creating a fused impression as a whole. In the more broad meaning, to find pleasure in interaction with any set of objects, humans need to perceive order among the parts of the set. Human brain is wired to see the connections, so finding such groups (based on elements being close together or having similar looks, sounds, or textures) feels aesthetically pleasing.

Paul Hekkert offers a multi-course meal as an example: a pleasing meal might have a variety of tastes between different courses, yet the unity is provided by the (common) consistency of tastes within each course.