Frantisek Kupka (Frank Kupka or Francois Kupka)
1871-1957, Czech painter.
http://www.artnet.com/artists/frantisek-kupka/
via : http://poramoralarte-exposito.blogspot.com/2020/10/frantisek-kupka-1871-1957.html
http://poramoralarte-exposito.blogspot.com/2020/11/frantisek-kupka-1871-1957.html