As babies we find out a lot about the world we are born into by deciding what we want to swallow and what we want to spit out – the good from the bad, the delicious from the gross. Before we have words we put the world in our mouth. We love things by chewing on them. Our likes and dislikes, what we want and what we don’t, are sucked on or spurned. Whatever we can grab we mouth. Or we’ll just stare at it, lying on our backs in a nappy.

On growing up we quickly become expert in what we don’t want – our No is nearly always more energetically defended than our Yes. Our whole world, as children, is reassuringly black and white. Either we embrace it or we keep at bay. What is bad is yuk, to be mistrusted and quickly gotten rid of. What we…