CEE lecturer Paul Kassabian has developed an iPhone/iPad app based on MIT CEE subjects. Unlike the courses, the application uses little text and no equations but instead teaches the behavior of structures through visuals: diagrams, animations and comparisons. Structures: A Visual Exploration explores cables, arches, domes, columns, trusses, beams, frames and prestressed beams. It can be purchased for $1.99 from iTunes. Kassabian teaches graduate course 1.572 Structural Systems. View and purchase the app.