This exhibition of 28 watercolors delights with lighthearted interpretations of the natural world that exploit the immediacy of water-based paintings on paper. Included are four rarely seen works by Winslow Homer, as well as the artist’s watercolor box. Important and compelling works by John Ruskin, John La Farge, Paul Klee, Eva Hesse and many others are also included. The Museum of Art has been collecting watercolors for more than a century; due to their light sensitivity, these works are on view only very infrequently and have not been shown in this breadth. Find them in the Shaw Ruddock Gallery through August 26.