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  2. Every Kid Outdoors - Wikipedia

    en.wikipedia.org/wiki/Every_Kid_Outdoors

    Every Kid in a Outdoors is a program run by the United States National Park Service in which fourth graders in the country receive free admission to National Parks, federal land, and water recreation areas. The program was created by Barack Obama in 2015 as Every Kid in a Park.

  3. Missing square puzzle - Wikipedia

    en.wikipedia.org/wiki/Missing_square_puzzle

    The missing square puzzle is an optical illusion used in mathematics classes to help students reason about geometrical figures; or rather to teach them not to reason using figures, but to use only textual descriptions and the axioms of geometry. It depicts two arrangements made of similar shapes in slightly different configurations.

  4. List of optical illusions - Wikipedia

    en.wikipedia.org/wiki/List_of_optical_illusions

    The Hering illusion (1861): When two straight and parallel lines are presented in front of radial background (like the spokes of a bicycle), the lines appear as if they were bowed outwards. Hollow-Face illusion: The Hollow-Face illusion is an optical illusion in which the perception of a concave mask of a face appears as a normal convex face.

  5. Template:Optical illusions - Wikipedia

    en.wikipedia.org/wiki/Template:Optical_illusions

    Template documentation This template's initial visibility currently defaults to autocollapse , meaning that if there is another collapsible item on the page (a navbox, sidebar , or table with the collapsible attribute ), it is hidden apart from its title bar; if not, it is fully visible.

  6. Necker cube - Wikipedia

    en.wikipedia.org/wiki/Necker_cube

    The Necker cube is an optical illusion that was first published as a rhomboid in 1832 by Swiss crystallographer Louis Albert Necker. [1] It is a simple wire-frame, two dimensional drawing of a cube with no visual cues as to its orientation, so it can be interpreted to have either the lower-left or the upper-right square as its front side.

  7. Geometrical-optical illusions - Wikipedia

    en.wikipedia.org/wiki/Geometrical-optical_illusions

    The widely accepted interpretation of, e.g. the Poggendorff and Hering illusions as manifestation of expansion of acute angles at line intersections, is an example of successful implementation of a "bottom-up," physiological explanation of a geometrical–optical illusion. Ponzo illusion in a purely schematic form and, below, with perspective clues

  8. Template:Magic and illusion - Wikipedia

    en.wikipedia.org/wiki/Template:Magic_and_illusion

    To change this template's initial visibility, the |state= parameter may be used: {{Magic and illusion | state = collapsed}} will show the template collapsed, i.e. hidden apart from its title bar. {{Magic and illusion | state = expanded}} will show the template expanded, i.e. fully visible.

  9. Grid illusion - Wikipedia

    en.wikipedia.org/wiki/Grid_illusion

    An example of the scintillating grid illusion. Dark dots seem to appear and disappear at intersections. The scintillating grid illusion is an optical illusion, discovered by E. and B. Lingelbach and M. Schrauf in 1994. [2] It is often considered a variation of the Hermann grid illusion but possesses different properties. [2] [3]