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Message: <blockquote data-quote="chalitha135" data-source="post: 1969128" data-attributes="member: 25805"><p style="text-align: center"><img src="http://www.harmsy.freeuk.com/images/pink_dots.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p> <p style="text-align: center"></p> <p style="text-align: center"><span style="font-size: 18px"><span style="font-family: 'Tahoma'"><strong>Circling Pink Dots</strong></span></span></p> <p style="text-align: center"><span style="font-size: 18px"><span style="font-family: 'Tahoma'"><strong></strong></span></span></p> <p style="text-align: center"><span style="font-size: 18px"><span style="font-family: 'Tahoma'"><strong>In a moment, stare at the black plus at the centre of the circling pink dots below.</strong></span></span></p> <p style="text-align: center"><span style="font-size: 18px"><span style="font-family: 'Tahoma'"><strong></strong></span></span></p> <p style="text-align: center"><span style="font-size: 18px"><span style="font-family: 'Tahoma'"><strong>The pink dots are not actually circling: there's one missing at any time and in quick succession the dots disappear then appear again. </strong></span></span></p> <p style="text-align: center"><span style="font-size: 18px"><span style="font-family: 'Tahoma'"><strong></strong></span></span></p> <p style="text-align: center"><span style="font-size: 18px"><span style="font-family: 'Tahoma'"><strong>Keep staring at the black plus: what happens to the pink dots? </strong></span></span></p> <p style="text-align: center"><span style="font-family: 'Georgia'"><strong><span style="font-size: 15px"><span style="color: Blue"></span></span></strong></span></p> <p style="text-align: center"><span style="font-family: 'Georgia'"><strong><span style="font-size: 15px"><span style="color: Blue">Explanation</span></span></strong></span></p> <p style="text-align: center"><span style="font-family: 'Georgia'"><strong><span style="font-size: 15px"><span style="color: Blue">still from the animationMost people think this is some sort of trick, with the animation gradually changing in front of your eyes. Not so!</span></span></strong></span></p> <p style="text-align: center"><span style="font-family: 'Georgia'"><strong><span style="font-size: 15px"><span style="color: Blue"></span></span></strong></span></p> <p style="text-align: center"><span style="font-family: 'Georgia'"><strong><span style="font-size: 15px"><span style="color: Blue">The illusion relies once again on persistence of vision. The human eye forms an image on the retina - the light sensitive part - and transfers information about the image to the brain. Just like film in a camera, this process involves reactions. The light falling on the retina stimulates nerves. It takes time for the stimulation to clear. Normally we don't look at one thing for a long period, so further stimulation happens, over-riding the last image about 20 times a second.</span></span></strong></span></p> <p style="text-align: center"><span style="font-family: 'Georgia'"><strong><span style="font-size: 15px"><span style="color: Blue"></span></span></strong></span></p> <p style="text-align: center"><span style="font-family: 'Georgia'"><strong><span style="font-size: 15px"><span style="color: Blue">If we stare at things, however, things are different - especially when what we stare at contrasting colours with a solid background colour. The eye grows used to the image it sees (in this case, mostly grey), and the nerves go on relaying the same information, over and over. </span></span></strong></span></p></blockquote><p></p>

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