a stumbling block, aeschines, alexander the great, anaximander, animals, antisthenes, art, averroes, boat, bouquet, creation of adam, crossroads, epicurus, eyes, federico ii duke of mantua, flower, flowers in a vase, francesco guardi, genre, head, henri moret, heraclitus, hypatia, knight, landscape, lovers on the river bank, marseille differ, michelangelo, national gallery london, nero, parmenides, path, pattern, people, peter paul rubens, pythagoras, raffaello santi, raffaello sanzio, raphael, religion, returning of the boats, river, rock, rome, sail, school of athens, scuola di atene, sea, sistine chapel, sitting on the bench, sky, socrates, stone, table, the field, tiger, tree, vase, vasnetsov, vatican, view, watercolor, young woman, zeno of citium