illusion_Ebbinghaus: Are they the same size?

[ahmedelshfie]

The applet design by prof Hwang, modified by Ahmed.
original applet illusion_Ebbinghaus: Are they the same size?

The Ebbinghaus illusion or Titchener circles is an optical illusion of relative size perception. In the best-known version of the illusion, two circles of identical size are placed near to each other and one is surrounded by large circles while the other is surrounded by small circles; the first central circle then appears smaller than the second central circle.

You can drag the top blue dot to check if they are all the same size.
Try to drag the sliders to discover the wonder of illusion!

data from http://en.wikipedia.org/wiki/Ebbinghaus_illusion

Embed a running copy of this simulation
<applet code='users.Eg.ahmed.illusion_Ebbinghaus_pkg.illusion_EbbinghausApplet.class' archive='http://www.phy.ntnu.edu.tw/ntnujava/ejsuser/37048/ejs_illusion_Ebbinghaus.jar' name='illusion_Ebbinghaus8154' id='illusion_Ebbinghaus8154' width='501' height='401' mayscript=true><param name='draggable' value='true'></applet>
Embed a running copy link(show simulation in a popuped window)
<a href='http://www.phy.ntnu.edu.tw/ntnujava/msg.php?smfejs=8154' target='smfejs'>Run simulation</a>

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Press the Alt key and the left mouse button to drag the applet off the browser and onto the desktop. This work is licensed under a Creative Commons Attribution 2.5 Taiwan License

• Please feel free to post your ideas about how to use the simulation for better teaching and learning.
• Post questions to be asked to help students to think, to explore.
• Upload worksheets as attached files to share with more users.

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