The principles of design you mentioned include variety, proportion, perspective, and radial balance. However, one of these terms does not fit well with the common principles of design.
- Variety: This principle refers to the use of different elements to create visual interest.
- Proportion: This principle involves the relationship between different elements in a design, often concerning their size and scale relative to one another.
- Perspective: This is typically more related to techniques in drawing and represents a way of depicting three-dimensional space and depth on a flat surface.
- Radial Balance: This principle refers to a circular balance where elements radiate from a central point.
Among these, perspective is the least aligned with the core principles of design as it is more about representation in art rather than a fundamental design principle like the others listed. You are likely looking for the one that does not belong with the others.