As part of the City Library in Solin on 7th of September 2015, Tetrin is opened. In the new space of 400 m2 there is part of the library, foayer, gallery and theater space with at least 90 seats equipped with professional stage equipment and intended for various theatrical content organized by Solin Library and performances of other theatrical organizations, concerts, smaller conferences, round tables etc. Behind the stage is a dressing room for performers and stage is adorned with art chair which is designed and manufactured in the workshops of nativity scenes at the library. The auditorium is in level with the stage and the floor, so that the program can be watched from the balcony, as well as from the three lodges, two of which are on the floor and one upstairs. The area also has a cafe. Tetrin is open weekdays from 8 to 20 pm, and Saturdays from 8 to 13. The room is multifunctional, so that enables simultaneous running of various activities.