Two young men in repose—one supports the other’s head with his leg as he rests his cheek against his companion’s stomach. Their bodies mirror each other in a coiled embrace as others linger nearby, talking in groups, relaxing solo, or gazing at the blue horizon of Lake Michigan. Other details—the clothing, Carrera-style sunglasses, Walkman headphones, and a can of Cherry Coke—date the image to the mid-1980s. Indeed, artist Doug Ischar took the photograph in 1985 at a de facto gay be...