“We must begin to remember art as something three-dimensional, like a hologram, where there is no past or present,” said the artist Pier Paolo Calzolari in a 2017 interview. One of Arte Povera’s most important figures, Calzolari creates installations of incredible detail out of elemental substances—plants, lead, fire, salt—materials he sees as symbols of existence. In this series of 22 works, Calzolari has drawn inspiration from the lemon. Combining tempera with pastel and coating the finished product with salt, he approximates the granulated skin of a lemon. The paintings are abstract, engaged with transience, a sunny yellow surface that eventually goes the way of all flesh. —E.C.