Artists Libby Reuter and Joshua Rowan have collaborated since 2011 on a project they call Watershed Cairns: large-scale color photographs of glass sculptures placed in watersheds throughout the Mississippi-Missouri river basin. Reuter, a sculptor and installation artist, creates reliquary-inspired glass “cairns” constructed from household or antique glass; each piece is made in response to a specific site. Because the cairns are too delicate to keep in place, Rowan photographs them to record their presence in the landscape. The artists display most photographs on watershedcairns.com as well as exhibit it in galleries and museums, with many cairns displayed with their corresponding photograph. See works from the artists’ current series at “Art Marks from Minnesota and Montana to the Confluence: Watershed Cairns by Libby Reuter and Joshua Rowan,” an exhibit opening at Bonsack Gallery on February 22 with a reception from 5:30-7:30 pm and running through April 10.