The study centre, dedicated to stereotomy, includes a series of plates and 3D models of stereotomic work done in southeastern Sicily and Malta. Among the models are 16th-century domed chapels from Comiso (San Francisco), Militello (Sant'Antonio), Modica (Santa Maria di Betlem), and Scicli (Sant'Antonio). Additional 3D models include some spiral staircases. Keep these in mind: the staircase with no central support of Santa Maria dei Miracoli and the oval one in San Mattia al Noviziato (both in Palermo); the double spiral staircase in the Theatine complex in Syracuse; and the oval staircase "Vis de Saint Gilles" in Malta's Verdala Palace. Other 3D models illustrate the complex solutions found for arch design in Noto's Villa Nicolaci and the Town Hall.