Constructed from a base structure of welded aluminium, Gates' raw skeleton has been concealed by a decorative golden mosaic finish. This mosaic veil recalls Byzantine church mosaics, commonly composed of golden tiling and appreciated not only for their lavish appearance, but also for their ability to brighten the interiors of these large churches by reflecting sunlight and candlelight.

Spowers' Gates consider the division between function and decoration. Gates are freestanding, displayed in isolation rather than as part of a fence or a wall. Removed from an architectural element, Gates is not functional, challenging the viewer to reconsider their purpose. The golden mosaic finish has been employed, as it was in Byzantine churches, to reflect the sunlight, creating a shimmering gateway in the woodlands.