Study in Green and  Blue Paul O'Connor 8" x 12"  ©  1999

Squaring the Square 4-Color Map Theory Paul O'Connor 5" x 6"  ©  2001

Red  Square Paul  O'Connor 5" x 6"  ©  2001

Homage to Mondrian Paul O'Connor 12" x 13"  ©  2001