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Captured Waterfall: Depth Capture in a Natural Setting

Depth capture is a phenomenon where a stereoscopically viewed surface captures part of the background texture to the same depth plane as the surface itself (Ramachandran and Cavanagh 1985). Although this phenomenon has been repeatedly demonstrated in laboratory settings, it has not been observed in natural settings. We have noticed a very salient depth capture in a waterfall located at Vanhankaupunginkoski rapids in Helsinki, Finland. The illusion consists of a waterfall and a bridge 40 m in front of it. When viewed from a distance of 300 m, the bridge captures the flowing water to a depth level with it (figure 1).