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A white sphere in front of a black sphere. From Jeff Ross (1997), Semantics of Media (Dordrecht: Kluwer), p. 73. © Kluwer. With kind permission from Springer Science and Business Media. |
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A black sphere in front of a white sphere. From Jeff Ross (1997), Semantics of Media (Dordrecht: Kluwer), p. 73. © Kluwer. With kind permission from Springer Science and Business Media. |
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A black sphere to the left. |
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A black sphere to the right. |
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A black sphere to the left from above. |
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A black sphere to the right from above. |
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An impossible triangle. Image from Wikimedia: |