This is an extraordinary sculpture. The face is maybe 2.5m high, and it is carved out of a block of Portland stone that has probably moved less than half a kilometre from where it formed.

Portland, the south coast of England.

The original shot was captured using a full-spectrum infrared-capable digital camera and a Candy Chrome filter. This filter allows some visible light to pass through as well as the full range of invisible (to us) near-infrared radiation. The different wavelengths are captured by the camera sensor and are then remapped ‘in post’ to different parts of the visible red-green-blue gamut, using a combination of specialist LUTs (look-up-tables) and some manual adjustments. In this case the adjustments created pink foliage and an aqua-marine sky, although as the stone surface itself was already neutral it remained largely grey in the final outcome.