The four pies represent the four large experiments at CERN (ATLAS, ALICE, LHCB and CMS).https://www.pi.uni-bonn.de/en/news/bonn-feiert-70-jahre-forschung-am-cern/img_3222.jpg/viewhttps://www.pi.uni-bonn.de/en/news/bonn-feiert-70-jahre-forschung-am-cern/img_3222.jpg/@@images/image-1200-65aa0eca113099f15e2b78b38742a81d.jpeg
The four pies represent the four large experiments at CERN (ATLAS, ALICE, LHCB and CMS).
