Another possible way of looking at things is that sessions obey the laws of phyiscs. If all the circumstances are the same everything turns out the same. We arrive we sit in the same places , exhibit the same behavour and the outcome is the same.   But sessions are very prone to chaos theory. Just one wee thing diffent can change the tone of the evening. Has someone had a bad day at work and has decided to drink more?   Is there a new arrival sitting on the edge of the session? Has the landlord got a new guest beer in?   The session mutates and for short time may become a new entity.   As in nature most mutations fail but occassionally the session has developed and will never be the same again.

So forget chaos theroy being defined by a butterfly flapping its wings - its whether the fiddler's remembered his glasses.

Julie