If I sometimes seem to emphasise the second unduly, it is for two reasons. In our reductionist culture it is the one of which we more urgently need reminding: a pragmatic reason. More importantly it is, like it or not, the ‘senior partner’ in their relationship: a metaphysical reason. The left hemisphere exists in service to the right. As long as this is respected, all goes well; when it is not, we court disaster. Each needs to be allowed its head: but at the end of the day the products of the first need to be taken up by the second into a newly enriched whole.