Most Costa Ricans and residents who attend concerts at the Teatro Nacional are aware vaguely that they are sitting on a floor that moves.
Under the seats of the theater are mechanisms that can level the floor. This usually takes place for state dinners when the government hosts many guests.
Now those interested can see the original plans for the floor. The Ministerio de Hacienda is putting the plans on display through April 15 in the lobby of the ministry building that is across Avenida Secunda from the theater. The plans are 117 years old.