Rock-Paper-Scissors Egg

1, This is a replica of a rock-paper-scissors egg I saw my daughter playing with You can also buy finished products online, but they aren't this large (several times smaller)

2, It uses a purely mechanical structure to randomly select one of four options I have included two replacement rotating balls, which you can substitute as desired

3, The structure can be driven by either a spring or a rubber band Spring specifications are 0.4*5*25 (a spring from a press pen will also work), and you can use whatever rubber band you have on hand (any driver will work depending on what you have available)