Step through the glass door of the Canada Pavilion—particularly amid Tuesday’s persistent rain—and you are likely to be taken aback by the humidity that greets you. That blast of warm air is just the first indication of the many adaptations made by artist Abbas Akhavan to transform the glass-and-brick structure into a literal greenhouse for “Entre chien et loup,” his presentation for this year’s Venice Biennale. Among the alterations to the structure are a series of grow lights and water misters, a new ventilation system, a film across the wood ceiling to protect it from moisture, and various structural improvements to accomodate the 6,000-gallon water tank that encompasses over half the floorplan and weighs roughly 25 tons. The transformations are meant to render the pavilion into a building-sized Wardian case, a Victorian-era terrarium used to transport foreign plants across the British Empire. It also recalls London’s Crystal Palace, built in 1851 for that year’s Great Exhibition, in which a genus of water lilies named after Queen Victoria were displayed as a natural wonder. Inside the …