Here's a bit of basic understanding of Gestalt principles.
https://www.interaction-design.org/literature/topics/gestalt-principles
These principles are used extensively in design, and often intuitively, rather than specifically by design.
Other factors often considered are:
Fibonacci numbers / sequences
The golden ratio (closely related to Fibonacci, but not quite)
And, of course, the main design principles, alignment, repetition, contrast, hierarchy and balance.
Others define these as contrast, emphasis, pattern, repetition, movement, space (which includes white space) and balance.
Just for fun, I'll also mention Vitruvius, who said all design was reliant on three main principles: firmitatis, utilitatis, venustatis, strength, utility, and aesthetic effect, sometimes translated as stability, utility and beauty.
Henry Wotton (1568-1639) changed this to 'commodity, firmness and delight', but that's pretty far from the correct translation.
While that relates, of course, directly to building, Vitruvius' writings inspired Michelangelo to draw "Vitruvian Man" and base that on Vitruvius' ideals of human proportion. And, that scale and proportion has an influence on what we perceive as "good" design and composition.
Last edited by MarkJerling; 06-16-2022 at 03:30 PM.