the.com/roughness
the texture you feel before you understand it, measured in microns and braille
unitmeasured in microns, finer than a human hair
grip secretperfectly smooth surfaces slip; tires need controlled roughness
shark skinmicroscopic toothy grooves cut drag underwater
engineered lowtelescope mirrors polished to nanometer roughness
soundacoustic dissonance is literally called auditory roughness