The dictionary defines beauty as the quality present in a thing or person that gives intense pleasure or deep satisfaction to the mind, whether arising from sensory manifestations (as shape, color, sound, etc.), a meaningful design or pattern, or something else (as a personality in which high spiritual qualities are manifest). I think it’s just whatever is pleasing to your eyes or spirit because how can a blind person know something is beautiful. Because they feel it. Their other senses take over to provide them with that feeling of pleasure which translates itself into beauty as they know it.