Book excerpt: The Baroque world was a flowing one, a realm of slippery presences in constant flux. Everything seemed to be in endless motion –space, time, emotions and the individual itself. It was a deeply shifting world, and this absence of solidity and certainty would come to define both the macro and the microcosms of these inconstant times. Like other Baroque phenomena, fluidity encompassed a rather complex and wide-ranging set of manifestations – from the swirls of angels on the ceilings of Pietro da Cortona and the polyvalence of space in the complex interiors by Guarini, to the fluidity of being that marked equally the statues of Messerschmidt and Bernini’s Borghese mythologies. This book charts different aspects of this fluidity, discussing fluid geographies, fluidity of presence, fluidity of spaces and materials, fluid souls and water in Baroque culture.