Abbas Kiarostami's Film Close-Up

For next week, please watch and respond to Abbas Kiarostami's film Close-up (1990, Iran), on Kanopy
Please read this essay by film scholar Gilberto Perez on Kiarostami's work:
In Abbas Kiarostami’s masterful exploration of the nature of truth and cinematic illusion, a young man introduces himself as celebrated director Mohsen Makhmalbaf, and enters intimately into the life of a family under the pretext that he’s scouting locations for a new film project. Deeply suspicious, the father investigates the stranger, leading to the con man’s exposure and arrest. At this stage, Kiarostami and his real-life film crew enter the story to film the imposter’s trial. Events preceding the young man’s arrest are dramatized and reconstructed, but with the real people “playing” themselves. Close-up has been widely hailed as one of Kiarostami’s crowning achievements and one of the greatest films of the 1990s.
Why do you think the film is called "close-up"? How does Kiarostami present this event? What layers does the film contain?