This is photography. No double exposures or Photoshopping; just pure photography. Asia-based Dutch artist Marcel Heijnen has developed a simple yet unique method to capture and present an alternate visual reality of our world using just a camera and an untreated clear glass panel. He roams Asia's urban centres to find weathered walls, places a large glass pane in front of them, and then waits for the light to hit nearby buildings just so. For a fleeting moment, he can capture their reflections while the patina of the wall behind it shows through. Two realities collapsed into one in a single moment. Residue is about duality and paradox — the old versus the new, the geometric versus the organic, urbanisation versus nature — tensions that ultimately lead to some kind of equilibrium, like a perpetual dance between decay and renewal.