<br class="c"/><a class='_ac _lb' lightbox='http://www.brainbashers.com/illusionimages/colsq1.gif '><img class='_ac _di img-fluid' style='width:250px; height:inherit; background: inherit;' data-delaysrc='http://www.brainbashers.com/illusionimages/colsq1.gif' src='http://www.brainbashers.com/illusionimages/colsq1.gif' /></a><br/><br/>Stare at the cross for 60 seconds and then move your mouse over the bar below to remove the colours. You should see a coloured afterglow. <br/><br/><a class='_ac _lb' lightbox='http://www.brainbashers.com/gifs/movemouse.gif '><img class='_ac _di img-fluid' style='width:259px; height:inherit; background: inherit;' data-delaysrc='http://www.brainbashers.com/gifs/movemouse.gif' src='http://www.brainbashers.com/gifs/movemouse.gif' /></a>