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The figure above shows nothing more than a series of overlapping circles, but they appear to form a three-dimensional tunnel when they are rotated in tandem (use the button to rotate).

ReferenceReferences

[1] C. L. Musatti, "Sui fenomeni stereocineti" ["On the stereokinetic phenomenon"], Archivio Italiano di Psicologia, vol. 3, pp. 105–120, 1924.
[2] J. Wilson, J. Robinson, and D. Piggins, "Wobble cones and wobble holes: the stereokinetic effect revisited," Perception, vol. 12, pp. 187-193, 1983.
[3] D. R. Proffitt, H. Hecht, I. Rock, and J. Schubert, "Stereokinetic effect and its relation to the kinetic depth effect," Journal of Experimental Psychology: Human Perception and Performance, vol. 18, pp. 3-21, 1992.