The application of glass in contemporary architecture explores perceptual phenomenon that intentionally change the way we experience space. SANAA'S recent work uses glass in a radical way, proposing a renewed approach to transparency. The Toledo Glass Pavilion, with most spaces defined by glass walls, presents an intense visual experience. The overiapping of glass produces perceptual effects that vary according to depth and lighting conditions. This paper proposes an altemative reading of these phenomena, beyond its aesthetical delight, based on contemporary artistic practices.