On my first day in the first memory class I ever took at university I remember the professor picking up a piece of paper. He waited for the eager class of 150 students to settle down, then held up the unfolded sheet of paper and proclaimed: ‘This is what happens in the world around us.’ He then folded the paper in half. ‘This is what you perceive.’ He folded the paper in half again. ‘This is what you pay attention to.’ He folded the paper in half again. ‘This is what you are interested in.’ Another fold. ‘This is what the brain makes into engrams. And this …’ (he folded the paper one final
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