Scientific Correspondence | Published:

Where is the sun?

Nature Neurosciencevolume 1pages183184 (1998) | Download Citation

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Abstract

When we interpret a shaded picture as a three-dimensional (3D) scene, our visual system often needs to guess the position of the light source in order to resolve a convex-concave ambiguity. For more than a century, psychologists have known that the visual system assumes that light comes from above and have argued that this assumption is ecologically justified because our everyday light source (the sun) is overhead. Our experiments reveal that people's preferred lighting direction is not directly overhead, but rather shifted to the left, and this preference is reflected in art spanning two millennia. Furthermore, we find a strong correlation between people's handedness and their preferred lighting. We suggest that what counts is not so much where the sun is, but where you like the sun to be.

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Acknowledgements

The authors are grateful to Dr. Marianne Tauber for providing the references to the Gestalt literature. Support was provided by the NSF Engineering Reasearch Center for Neuromorphic Systems at Caltech.

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Affiliations

  1. California Institute of Technology 136-93, Pasadena, 91125, California, USA

    • Jennifer Sun
    •  & Pietro Perona
  2. Universita di Padova, Via Ognissanti 72, Padova, 35131, Italy

    • Pietro Perona

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Correspondence to Pietro Perona.

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https://doi.org/10.1038/630

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