"That would be the rather large Constellation class ship hovering above the City. I have tried to relegate it to the park area, but just as the buildings and landscapes seem to change, so does the air. And I have yet to develop a means of controlling such changes."
But, do not fear, Spock was no stranger to enigmas. Although he would never admit it (for emotions were supposed to be foreign to him,) he did enjoy a good puzzle now and again. It helped to clear his mind.