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Orchid bees fly towards the brightest point in an aperture. (a–c) Bees were presented with 150 mm circular apertures in which the position of the centre of brightness had been manipulated using a series of overlapping neutral density filters. The centre of brightness was moved 45° up and left (a), down and right (b) or centred (c). (d–f) The apertures shown in (a–c) processed to represent how it might be perceived by orchid bees (other details as in figure 2d).
