Which of the following is NOT a design principle?

Texture is indeed a characteristic often considered in the aesthetic and sensory evaluation of materials and products, but it is not classified as a design principle in the same way that balance, contrast, and asymmetry are.

Design principles are foundational concepts that guide the arrangement and organization of visual elements in a design, helping designers create coherent and effective compositions. Balance refers to the distribution of visual weight in a design, ensuring stability and harmony. Contrast involves employing differences in visual elements to create interest and highlight key features. Asymmetry is a specific approach to achieving balance by distributing elements unevenly, allowing for dynamic and engaging layouts.

In contrast, texture pertains to the surface quality or feel of an object and influences tactile interaction, but it does not structure the compositional framework, nor does it serve as a guiding principle in the same way as the other options. Thus, texture stands apart as an element rather than a principle of design.