Defective phosphor dot of a CRT (a Medion MD1998LE, a 19″ CRT display). The dot appears as red when it should be white. (The dates are wrong because I didn’t set the camera clock.)
<a href="//commons.wikimedia.org/wiki/User:%5Cldblquote" title="User:\ldblquote">\ldblquote</a>
2007-09-15
<span class="int-own-work" lang="en">Own work</span>