Form exists everywhere. Look around and it is visible in everything you see. When your eyes signal your brain to stop and take note, you develop taste. Lines & shapes materialize in their own way. You begin to look for things you prefer.
Vers une architecture [Towards an Architecture]
"Our eyes are made to see forms in light; light and shade reveal these forms; cubes, cones, spheres, cylinders or pyramids are the great primary forms which light reveals to advantage; the image of these is distinct and tangible within us without ambiguity. It is for this reason that these are beautiful forms, the most beautiful forms. Everybody is agreed to that, the child, the savage and the metaphysician."