Definitions

from The Century Dictionary.

  • noun A kind of stereoscope that makes concave parts appear convex, and convex parts concave.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Opt.) An instrument which exhibits objects with their proper relief reversed; -- an effect opposite to that produced by the stereoscope.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun optics An optical instrument that reverses perception of depth.

Etymologies

Sorry, no etymologies found.

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Examples

  • The 'pseudoscope' (Wheatstone was partial to exotic forms of speech) was introduced by its professor in 1850, and is in some sort the reverse of the stereoscope, since it causes a solid object to seem hollow, and a nearer one to be farther off; thus, a bust appears to be a mask, and a tree growing outside of a window looks as if it were growing inside the room.

    Heroes of the Telegraph John Munro 1889

  • Make a pseudoscope, a reverse depth perception toy

    Boing Boing 2009

  • In the new MAKE weekend project, Kipkay shows how to make a pseudoscope, an "amazing optical toy that plays tricks on your brain."

    Boing Boing 2009

  • Of course in this practical age the inquiry is put -- Of what use is the stereoscope or pseudoscope?

    Chambers's Edinburgh Journal, No. 426 Volume 17, New Series, February 28, 1852 Various 1836

  • With respect to the pseudoscope -- which makes the outside of a teacup appear as the inside, and the inside as the outside; which transforms convexity into concavity, and the reverse; and a sculptured face into a hollow mask; which makes the tree in your garden appear inside your room, and the branches farthest off come nearest to the eye; and which, when you look at your pictures, represents them as sunk into a deep recess in the wall, -- with respect to this instrument, its practical uses have yet to be discovered.

    Chambers's Edinburgh Journal, No. 426 Volume 17, New Series, February 28, 1852 Various 1836

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