<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/500cd275-15cc-423c-8ae1-ecb12d800872/F566FCCD-D8EA-4CA5-A64C-CFF9BA0F1C98/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://antwrp.gsfc.nasa.gov/apod/ap091004.html" href="http://antwrp.gsfc.nasa.gov/apod/ap091004.html" style="font-size: 11px;">antwrp.gsfc.nasa.gov</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://antwrp.gsfc.nasa.gov/apod/ap091004.html"><div align="center"><img src="http://content6.clipmarks.com/blog_cache/antwrp.gsfc.nasa.gov/img/02E8B3DB-D7CB-44C1-BE22-A7395DA3271E" alt="See Explanation. Clicking on the picture will download the highest resolution version available." /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://antwrp.gsfc.nasa.gov/apod/ap091004.html"><CENTER> <B> The Same Color Illusion </B> <B> Credit: </B> <A href="http://web.mit.edu/persci/people/adelson/" linkindex="2">Edward H. Adelson</A>, <A href="http://en.wikipedia.org/wiki/Image:Same_color_illusion.png" linkindex="3">Wikipedia</A> </CENTER></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://antwrp.gsfc.nasa.gov/apod/ap091004.html"><P> <B> Explanation: </B> Are square A and B the same color? They are. Are too. To verify this, click <A href="http://antwrp.gsfc.nasa.gov/apod/image/0707/samecolor_wikipedia_connected.jpg" linkindex="4">here</A> to see them connected. The <A href="http://web.mit.edu/persci/people/adelson/checkershadow_description.html" linkindex="5">above illusion</A>, called the <A href="http://en.wikipedia.org/wiki/Same_color_illusion" linkindex="6">same color illusion</A>, illustrates that purely human observations in science may be <A href="http://www.badastronomy.com/bablog/2007/06/29/you-spin-me-right-round/" linkindex="7">ambiguous</A> or inaccurate. Even such a seemingly direct <A href="http://www.youtube.com/watch?v=y8U0YPHxiFQ" linkindex="8">perception</A> as relative color. Similar illusions exist on the sky, such as the <A href="http://antwrp.gsfc.nasa.gov/apod/ap020130.html" linkindex="9">size of the Moon near the horizon</A>, or the <A href="http://antwrp.gsfc.nasa.gov/apod/ap070305.html" linkindex="10">apparent shapes of astronomical objects</A>. The advent of automated, reproducible, measuring devices such as <A href="http://en.wikipedia.org/wiki/Charge-coupled_device" linkindex="11">CCDs</A> have made science in general and astronomy in particular less prone to, but not free of, <A href="http://www.youtube.com/watch?v=w8Zz05t19dg" linkindex="12">human-biased</A> <A href="http://www.michaelbach.de/ot/" linkindex="13">illusions</A>. </P></blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;">&nbsp;</td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/F566FCCD-D8EA-4CA5-A64C-CFF9BA0F1C98/blog/" title="blog or email this clip"><img src="http://content9.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>

New from the makers of Clipmarks:  Amplify.com - Don't just share the news...Amplify it!