In 1953, the artist Willem de Kooning agreed to give his fellow artist, Robert Rauschenberg, a drawing to erase. Rauschenberg worked on the drawing for over a month using a variety of erasers. Despite all efforts, traces of the original drawing remained. In 2010, digital imaging revealed much of the original drawing. This act of erasure symbolises attempts to erase histories, whether individual or collective. Neuroscientist, Charan Ranganath, finds that within 20 minutes people forget 40% of what they learn and after a few days only 20% is remembered. Since the past is over, why should we remember? It helps in making sense of the present and making better choices for the future. Daniel Kahneman, author of Thinking Fast and Slow, says memories are all we get to keep from our experience of living. In reality memory is selective and may be far from accurate. Some memories are preserved in diaries and letters, or in autobiographies, but even the most meticulous ...