Book review of Objects in Air: Artworks and Their Outside around 1900 by Margareta Ingrid Christian. University of Chicago Press, 2021. 304 p. ill. ISBN 978-0-226-76477-1 (h/c), $45.00. Reviewed January 2022 by Kristan M. Hanson, Digital Managing Editor, Plant Humanities Initiative, Dumbarton Oaks, kmhanson2020@gmail.com.