Caresses, by Fernand Khnopff Decadence and Dark Dreams: Belgian Symbolism Ralph Geis (ed.), Hirmer, 2020, hardback, 336pp, fully illus., €45/£42/$50 ALEXANDER ADAMS immerses himself in disquiet and dreamscapes Berlin’s Alte Nationalgalerie exhibition of Belgian Symbolists, Decadence and Dark Dreams: Belgian Symbolism, closed last month. As few were able to attend, for obvious reasons, this article…