They've since collaborated on a variety of disparate projects, including a study of how flounder fish change their body colouring to fit in with their background. That was also published in Nature, but this time the journal insisted on removing the co-writers' puns.
Ramachandran, who is 59, is known for what his critics see as sophomoric humour. In The Tell-Tale Brain, he recounts the neurological case of a man who saw a different woman each time he looked at his wife. "We should all be so lucky," quipped Ramachandran when speaking to the man's lawyer on the phone. The lawyer duly hung up. "My sense of humour is not always well received," he admits.
While grounded on the page, he, like Sacks, is easily lost in abstraction in life. He continually forgets where he has parked his car, for example, and can't remember his wife's birthday; they've been married for 24 years. His mind seems to be relentlessly engaged in much larger questions than the whereabouts of his car.