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Optical Illusions

  • Optical Illusion: Illusion Box
    The accompanying engravings show a most interesting form of electrically operated illusion consisting of a box divided diagonally and each division [...]
    - September 19, 2006
  • Optical Illusion: Inclined Letters
    When looking at the accompanying sketch you will say that the letters are alternately inclined to the right and left. [...]
    - September 12, 2006
  • Optical Illusion: Broken Ring?
    The engraving shows a perfectly straight boxwood rule laid over a number of turned brass rings of various sizes. Although the [...]
    - September 9, 2006
  • Optical Illusion: Three Circular Figures
    By giving the page a revolving or rinsing motion the three circular figures printed on the next page appear to rotate. [...]
    - September 7, 2006