A SERIES OF TEN TUBULAR BLOWN-GLASS sculptures, each the size and shape of an internal organ, sat on curvy, custom-built fiberboard tables distributed like islands in an archipelago throughout the Yeh Art Gallery at St. John’s University in New York this past fall. Part of Finnish artist Tuomas A. Laitinen’s beguiling exhibition “The Boneless One,” the knotty sculptures—some of them splotched with algal color—contain as many as five internal chambers and are designed to be playgrounds for octopuses. When at rest on the tables, the sculptures, titled collectively “A Proposal for an Octopus” (2016–), produce faint shadows and prismatic glints; they also possess a material heft in pleasing tension with those diaphanous effects.