What concept does not fall under design principles?

The concept of transparency does not fall under traditional design principles because it is more related to materials and finishes rather than the foundational principles that guide the composition and arrangement of design elements. Design principles typically focus on characteristics that influence how elements relate to each other in a visual composition, which includes the effective use of space, balance, and rhythm.

Negative space refers to the use of the area around and between the subjects of an image, while symmetry deals with balance and harmony in a layout. Patterns involve the repetition of elements in a design, creating rhythm and unity. Each of these concepts plays a significant role in how designs are visually perceived and understood, aligning closely with traditional design principles that guide visual arrangement and interaction.

In contrast, transparency as a concept is more specifically tied to the properties and behaviors of materials in design rather than foundational principles. It can refer to how light passes through materials but does not inherently guide the overall structure or organization of a design in the same way the other concepts do.