What Ukrainian-American artist, best known for his Cubist-inspired sculptures, was granted a patent in 1927 for a motorized structure that allowed painted images to move?

What American painter — identified with the movements of monochrome painting, minimalism, and conceptual art — is best known for abstract, white-on-white paintings?

Answers here~ https://schristywolfe.com/2015/05/30/may-30/