Gut instinct versus hard facts
Because theatre is live and therefore endlessly mutable, it is one of the most instinctive, intuitive and personal art forms around to respond to: whatever we feel about it cannot be a snapshot of the event in its entirety, but only of the particular performance we attended. It makes the persistent reliance on a single press night - usually very early in the run, unless you're Spiderman - Turn Off the Dark, that is "…