Influenced by the seascapes and skies of Southern California, Valentine was an early pioneer of using industrial plastics and resin to produce monumental sculptures that reflect and distort the light and space that surround them. For Valentine, a smooth surface was the whole point of the work and he did not want it to look old. While he was teaching a course in plastics technology at UCLA in 1965, he wanted to produce a polyester resin in large volumes that would not crack from curing.