Concentration is not particular to live arts, but is useful in any activity in which one needs focus. The particular thing is perhaps the type of concentration. For actions and responses to be coherent with the whole within the performance, the attention needs to spread over what one has to do and what is happening, while remaining concentrated on where the action is going. It is not being adrift without direction, at the mercy of circumstance. and neither is it having tunnel vision and pressing on with a fixed agenda no matter what. In fact, lunging ahead single-mindedly is rarely a useful strategy. An open concentration is what allows us to find alternative ways to avoid obstacles or even see out of the corner of our eye how an opportunity that we hadn’t even envisaged opens up..