I like to consider myself a reasonably intelligent lad. I seriously do believe that I've got a bit of smarts in me. Which is why I suprise myself by utterly missing some of the most obvious things in the world. For example, it was only last night that I realized that every Tetris block consists of four squares, and that the set of Tetris blocks is every possible arrangement of four joined squares.

I'm not going to try and think about how many years it took me to figure that one out.