František Kupka, Shape of Blue, 1913-24. O/C 73 x 60 cm, NG Prague. Source: Painting the Universe-Kupka-Pioneer in Abstraction.
Neugebauer Petr – osobní web
František Kupka, Shape of Blue, 1913-24. O/C 73 x 60 cm, NG Prague. Source: Painting the Universe-Kupka-Pioneer in Abstraction.