that never studied before. the fragments come in all sorts of sizes, from tiny bits of rubble to big pieces. so no—one knows exactly how these frescoes look like. there are lots of missing pieces. it's not like an ordinary puzzle. there will be a lot of holes in this fresco. these are three—dimensional pieces which are flat on one side. 0n the flat side, there is usually some decoration, some colour, and there is a kind of a three—dimensional structure, and these pieces do not match exactly, so it's a very difficult and challenging problem. the puzzle has remained unsolved for decades, and now, a team led by ca' foscari university of venice, will create a robotic system to analyse and eventually piece together the frescoes. called repair, or reconstructing the past: artificial intelligence and robotics meet cultural heritage, it's the first time machine learning and artificial intelligence techniques will be