Pieter Bruegel the Elder (ca 1525-1569), Christ carrying the Cross, also know as The Procession to Calvary, 1564, detail 4.
Kunsthistorisches Museum, Vienna

In the landscape Bruegel painted an unfamiliar impressive rocky formation on top of which perches a windmill. The significance of Bruegel’s intention is still to be understood. Or is the foolish appearance of a windmill resting on a rock just a reference to the folly of mankind?