Think of appearance as a “texture”. It has a certain feel. Smoothness ,roughness, curvatures, shapes. Colors bring added textures: blues and greens usually feel cool, reds feel hotter, blushes are warm.
Appearance is texture.
Now, does intelligence have a texture?
Ok, how do you know what is intellligence?
Word combinations usually. Word combinations are poetry. Poetry has a texture, both with rhythm and also with whatever concepts form in the brain.
Concepts have texture. All textures.