Forgetfulness is like a river that flows without beginning or end, meandering through the valleys of our memory, the landscape constantly changing. But look, there, beyond, where the mountains rise and the sky is deep blue, other thoughts appear, as if the weather of the mind suddenly changes. The thought of yesterday, perhaps that one puzzle you almost solved, fades into the distance as you focus on those flickering lights on the horizon. They are new ideas, discoveries that have nothing to do with what lies behind you, but promise something new.