From the collector...
George Kremer calls "Bust of an old man with turban" (ca 1627 - 1628) by Rembrandt van Rijn "a study of light", as
the artist here studies the incidence of light. The light comes from somewhere
upper left behind the man, lluminating directly: the goldthread on the turban, the blood flow thru the right ear, the wrinkly old skin, the scarf around the old man's neck
and on his shoulder, catching the tip of the feather as well as the right side of his
nose. And indirectly by the reflections from the back wall (which is left
turban below the clasp, the left
clothing & the ridge
of the nose.