brunlesc's tor perspective and applit with astonishing effect, was masaccio. on the wall of a church in florence, masaccio created a three-dimensional illusion unlike any the world had ever seen. ( reverent music ) this extraordinary work, called "the trinity," finished about 1427, is the first known painting to demonstrate true linear perspective. for the people of masaccio's day, it was as if t artist had dissolved the wall and created a new room, yet it was still a painting, just an illusion. the scovery of linear perspective opened up a new world for the masters of the renaissance, and they excitedly explored its vast potential. ( orchestral music ) obviously, these artists have found a powerful, new tool to work with, but why limit it to just paints and brushes? the technique shows up in sculpture from the period as well. this piece is no more than a meter high, but thanks to linear perspective, it successfully conveys a feelinof vasspace. not far from florence, in the city of urbino, st one of the most unusual examples in a small study inside this palace