Liberty Science Center and Google designed an interactive exhibit based on the Rubik's Cube.[16] It opened at LSC in Jersey City, NJ, in April 2014 in celebration of the 40th anniversary of the Cube's invention before traveling internationally for 7 years.[17] Exhibition elements include a 35-foot-tall rooftop cube made of lights that people can manipulate with their cellphones, a $2.5 million cube made of diamonds, a giant walk-in cube displaying the inner workings of the puzzle, and cube-solving robots.[18]