And in New Mexico, children on the U.S. and Mexican sides of the border wall were able to play together after two California professors installed a cross-border seesaw that fits through the steel slats separating the two countries. The idea for the “Teeter-Totter Wall” came from architecture professor Ronald Rael and design professor Virginia San Fratello, who originally conceived of the project in 2009. “The wall became a literal fulcrum for U.S.-Mexico relations,” said Ronald Rael. “Actions that take place on one side have a direct consequence on the other side.”