After the initial surprise caused by the façade in traditional style—which combines harmoniously with the atmosphere of one of the oldest plazas in the city—and the absolute contemporariness of the interior of the building, the visitors will find a three-dimensional representation of the solar system on a scale of 1:120,000,000 with the position exhibited by the planets in connection to the sun at 4:24 pm, on 21 June 1986. This configuration was chosen given its adjustment to the size of the room. The planets hang from the ceiling in which a section of the sky is shown by means of 2,500 orifices on the false ceiling.