This story is set in the future, sometime around the year 2055 or later. In this setting, a time machine has been developed. It isn't explained if the machine is a proprietary technology (not something owned or controlled by the government) but it is mentioned as requiring a significant amount of bureaucracy and fees in order for the government to allow its operation; presumably the dangers inherent in such a device are understood, but those in power think that typical methods of control will be sufficient to guard against its improper use. This is a theme in several of Bradbury's works, carrying a theme that certain technologies exceed the ability of human culture to integrate them in an appropriate way, if an appropriate integration is possible at all.

In what may be considered a frivolous application, the device is used to conduct time safaris, in which the hunter goes into the distant past to hunt animals which are extinct in modern times. The device is not given significant description, other than that it appears to be something like a small booth in which several people can stand, and the device travels to the destination along with the travelers, allowing them to enter it when they plan to return.