I can take any empty space and call it a bare stage. A man walks across this empty space whilst someone else is watching him, and this is all that is needed for an act of theatre to be engaged.
A critic is always serving the theatre when he is hounding out incompetence. If he spends most of his time grumbling, he is almost always right. The appalling difficulty of making theatre must be accepted: it is, or would be, if truly practised, perhaps the hardest medium of all: it is merciless, there is no room for error, or for waste.