I have been struggling to understand a Concept about something at the work for the last 3 days. Initially, when I started, it was all black.. till a few moments ago it was still black hole (even though I had been filling a few pages drawing boxes and arrows while trying to understand it).. and then suddenly the blackness dissolved as I was hit by enlightenment. The Concept made perfect sense now. It is the moments like this that make the lighthouses of the life - beacons of hope, that I am not dull 
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Thought for the day - to reach a particular point of thought, where you have a clear picture of the thing, you have to struggle through hours of working through cobwebs misunderstanding and pitfalls.
Update: Enlightenment followed by nice dinner and icecream is much better