Stereoscopic photograph: 'HRH the Prince of Wales in the Garden of the chateau which was his headquarters in France'. One of 100 stereoscopic photographs associated with World War One, Western Front (1914-1918).From the collection of the former Buffs Regimental Museum.Stereographs consist of two identical photographs paired in such a way that when seen through a special viewing instrument, a stereoscope, they appear as a three-dimensional images. By 1899 the photographs were mounted on thick card that was given a slight curvature to increase the illusion of depth.