Systems for presenting an image indicating a position for a person are disclosed. A system includes: a hardware processor, a computer readable memory, and a computer readable storage medium associated with a computer device; at least one camera; program instructions of a free space determiner configured to determine at least one free space in a location using the at least one camera; program instructions of a new position determiner configured to determine, for a first person in the location, a new position based upon the at least one free space in the location determined by the free space determiner; and program instructions of an image presenter configured to present an image in the location to indicate the new position for the first person in the location determined by the new position determiner.