The following illustrations have been approved for publication:
 
 
 

· P. Klee (Fig. 12) (©) by COSMOPRESS Geneve & A-DAG. P. Paris, 1984 
    Paul Klee 1921, 24 "Zimmerperspektive mit Einwohnerm", Oelfarbezeichnung und Aquarell,
    franzosisch Ingres weiss / 48, 4: 31, 6 / signiert links unten / Paul Klee-Stiftung, Bern, F23 
· R. Magritte (color illustration 17) (©) by A.D.A.G.P. Paris, 1984 
· W. Kandinsky (Fig. 11) (©) by A.D.A.G.P. Paris, 1984 
· M.C. Escher (Figs. 182, 220, 368, 370, 372, 506, 511, 515, 519) (©) by S.P.A.D.E.M. Paris, 1984 
· H. Mattisse (Fig. 669) (©) by S.P.A.D.E.M. Paris, 1984 
· P.C. Mondrian (Fig. 2, 226) (©) by S.P.A.D.E.M. Paris, 1984. 
 

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