The sun was now low beneath the horizon. Darkness spread rapidly. None of my selves could see anything beyond the tapering light of our headlamps on the hedge. I summoned them together. "Now," I said, "comes the season of making up our accounts. Now we have got to collect ourselves; we have got to be one self. Nothing is to be seen any more, except one wedge of road and bank which our lights repeat incessantly. We are perfectly provided for. We are warmly wrapped in a rug; we are protected from wind and rain. We are alone. Now is the time of reckoning. Now I, who preside over the company, am going to arrange in order the trophies which we have all brought in. Let me see; there was a great deal of beauty brought in to-day: farmhouses; cliffs standing out to sea; marbled fields; mottled fields; red feathered skies; all that. Also there was disappearance and the death of the individual. The vanishing road and the window lit for a second and then dark. And then there was the sudden dancing light, that was hung in the future. What we have made then to-day," I said, "is this: that beauty; death of the individual; and the future. Look, I will make a little figure for your satisfaction; here he comes. Does this little figure advancing through beauty, through death, to the economical, powerful and efficient future when houses will be cleansed by a puff of hot wind satisfy you? Look at him; there on my knee." We sat and looked at the figure we had made that day. Great sheer slabs of rock, tree tufted, surrounded him. He was for a second very, very solemn. Indeed it seemed as if the reality of things were displayed there on the rug. A violent thrill ran through us; as if a charge of electricity had entered in to us. We cried out together: "Yes, yes," as if affirming something, in a moment of recognition.
In order for an improvised scene to be successful, the improvisers involved must work together responsively to define the parameters and action of the scene, in a process of co-creation . With each spoken word or action in the scene, an improviser makes an offer , meaning that he or she defines some element of the reality of the scene. This might include giving another character a name, identifying a relationship, location, or using mime to define the physical environment. These activities are also known as endowment . It is the responsibility of the other improvisers to accept the offers that their fellow performers make; to not do so is known as blocking, negation, or denial, which usually prevents the scene from developing. Some performers may deliberately block (or otherwise break out of character) for comedic effect—this is known as gagging —but this generally prevents the scene from advancing and is frowned upon by many improvisers. Accepting an offer is usually accompanied by adding a new offer, often building on the earlier one; this is a process improvisers refer to as "Yes, And..." and is considered the cornerstone of improvisational technique. Every new piece of information added helps the improvisers to refine their characters and progress the action of the scene. The "Yes, And..." rule, however, applies to a scene's early stage since it is in this stage that a "base (or shared) reality" is established in order to be later redefined by applying the "if (this is true), then (what else can also be true)" practice progressing the scene into comedy, as explained in the 2013 manual by the Upright Citizens Brigade members.