Word Shavings: Reverie

I've started reading Thomas Ogden's 'Reverie & Interpretation : Sensing Something Human (Karnac Books, 2005 edition). It's a great book about psychoanalysis.
He has some very astute, useful comments about the psychoanalytic process and the importance of language in that.
'Words and sentences', he writes, must be allowed a 'certain slippage'.
He cautions against stifling imagination by insisting on trying to define what we mean by 'ever increasing precision'.
"Imagination depends on the play of possibilities' (Reverie & Imagination, p3)..
Slippage, I like that.