Karel Appel (1921-2006) _Untitled_ signed and dated 'appel '80' (lower left) acrylic on paper laid on canvas 76 x 56cm. Executed in 1980...

Karel Appel (1921-2006) _Running Boy with Bird_ signed 'Appel' (lower right); titled 'Runaway Boy with Bird' (on the stretcher); signed and dated 'ck. appel 1971' (on the reverse) oil on canvas 81...

Karel Appel (1921-2006) _Untitled_ signed 'appel' (lower right) acrylic on paper laid on canvas 110 x 75.5cm. Executed in 1982...

Karel Appel (1921-2006) _Black Cat_ signed 'appel' (upper right) oil on canvas 48 x 62.5cm. Painted in 1979...

Karel Appel (1921-2006) _La Fleur et les oiseaux (The Flower and the Birds)_ signed and dated 'ck. appel '51' (lower right); signed, inscribed and dated 'Liege ck. appel 1951' (on the stretcher) oi...

Karel Appel (1921-2006) _Untitled_ signed 'appel' (lower right) oil on canvas 80.5 x 65cm. Painted in 1967...

Karel Appel (1921-2006) _Untitled_ signed and dated 'appel 74' (lower left) oil on canvas 81.5 x 100.5cm. Painted in 1974...

Karel Appel (1921-2006) _Untitled_ signed and dated 'ck. appel 53' (on the underside) glazed ceramic diameter: 25cm. Executed in 1953...

Karel Appel (1921-2006) _Untitled (Questioning Children)_ signed 'k. appel' (lower left) wax crayons on paper 10.5 x 16.5cm. Executed in 1949...

Karel Appel (1921–2006) _The Crowned King_ signed 'Appel' (lower left); signed again and dated 'Appel 1959' (on the reverse) oil on canvas 45 ¾ x 35 in. (116.2 x 88.9 cm.) Painted in 1959....