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2. 25 Fun and Festive Farewells for Your Elf on the Shelf - AOL

   www.aol.com/25-fun-festive-farewells-elf...

   Set up a fun scene using a spiral portal poster or any optical illusion print and place your elf inside to prepare for takeoff. Get the tutorial at Finding Myself Young .

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. Magic kits that help kids understand the science of illusion

   www.aol.com/magic-kits-help-kids-understand...

   Online tutorials give kids everything they need to know to perform for you. It features 25 tricks that include an optical illusion (a nice segway to talking about our brains), special contraptions ...

5. Shepard elephant - Wikipedia

   en.wikipedia.org/wiki/Shepard_elephant

   Shepard first published this optical paradox in his 1990 book Mind Sights (page 79) giving it the name "L'egs-istential Quandary". [2] It is the first entry in his chapter on "Figure-ground impossibilities". The pen-and-ink drawing is based on a dream Shepard had in 1974, and on the pencil sketch he made when he woke up. [2]

6. Vanishing puzzle - Wikipedia

   en.wikipedia.org/wiki/Vanishing_puzzle

   Interactive SVG of The Disappearing Bicyclist – in the SVG file, move the pointer to rotate the disc. A vanishing puzzle is a mechanical optical illusion comprising multiple pieces which can be rearranged to show different versions of a picture depicting several objects, the number of which depending on the arrangement of the pieces.

7. File:Optical Illustion-Ambiguous Patterns.svg - Wikipedia

   en.wikipedia.org/wiki/File:Optical_Illustion...

   Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.

8. List of optical illusions - Wikipedia

   en.wikipedia.org/wiki/List_of_optical_illusions

   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. Hybrid image: A Hybrid image is an optical illusion developed at MIT in which an image can be interpreted in one of two different ways depending on viewing distance. Illusory contours

9. This train track optical illusion has derailed the entire ...

   www.aol.com/news/2016-04-08-this-train-track...

   In this illusion, two figures that are identical (i.e. the two train track segments) appears to be different sizes while lying perpendicular to each other on a flat surface -- the lower one ...