The sum of two shadows

Same idea as yesterday's - two lights - one lighting each hand - and, where the shadows overlap, you get something twice as dark (or half as light).

In other news, I am winning the World Cup. Well, to qualify that, I am currently leading, by a narrow margin (one of) the predict-the-results-of-the-world-cup-matches competitions at work.

Still lots of work to do before I go on holiday but, luckily, I am getting to the point where I don't care. I should have thought of that earlier.