I still remember walking down the as-usual deserted Inman Street in Cambridge, Massachusetts and suddenly pulling up short and looking around as the smell of my mother’s sambhar surrounds me! At that moment I would have given anything to get a taste of that sambhar! But I knew there were no Indian households in the area. I knew none of the sealed double-glazed windows in the vicinity could be the source of the smell. I was, in fact, having an olfactory hallucination. Oliver Sacks, one of the most prolific neurologist-writers who through his writings let us look inside human brains through the eyes of his patients, said, while talking about his book Hallucinations, ‘We see with our eyes, but we see with our brains as well. Seeing with the brain is called imagination’. When I sit and stare into space daydreaming, I call that imagination. Michelangelo hanging upside down under the ceiling of the Sistine Chapel and visualising the hand of god reaching out to man; I call that imagination....