A gold panner in moonlight, a lone boy at a scenic outlook and a camper van headed into the mountains were some of the evocative but lonely subjects of Canadian artist Tim Gardner’s last solo show at 303 Gallery, created during the days of pandemic isolation. His new watercolor and ink paintings at 303 have subtracted humans from the picture entirely, instead featuring horses, police bikes (minus riders) and flowers. While the bikes beg the question of where the humans are, Gardner’s horses and flowers have a powerful and lively presence of their own. Here, a cluster of tulips sways in unison, a welcome pronouncement of the arrival of spring and nature’s beauty. (On view in Chelsea through May 25th).