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Visual Illusion
To use any of the clipart images above (including the thumbnail image in the top left corner), just click and drag the picture to your desktop. You may also control-click (Mac) or right-click (Windows) and choose "Save file to disk" from the pop-up menu. Click here for help downloading and using clipart files.
* A TIFF file is a high-resolution (240 dpi) format. TIFF files should be used only if you are printing the clipart. Do NOT use TIFF files for clipart that will displayed on a computer screen. Click here for help downloading and using TIFF files. File Name: illusion_5
Description: Print this figure on a sheet of paper and then give it a slight twirling motion as if you were swirling water around in a dish. The cog-wheel on the left will appear to revolve slowly, while the wheel on the right turns rapidly in the opposite direction.
Source: University Society Editorial Board, Boys and Girls Bookshelf (New York: The University Society, 1920)4:30
Keywords: Visual illusion
Copyright: 2009, Florida Center for Instructional Technology. See license.
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Clipart ETC is a part of the Educational Technology Clearinghouse and is funded by various grants. Produced by the Florida Center for Instructional Technology, College of Education, University of South Florida. Email the project manager.