Metal balls of diffent sizes are dropped at the start and they roll so that only certain balls can reach certain destinations, e.g. smaller balls can take the one path to the far right and the middle sized ball can only reach the second level down to the right before it's stopped by the bump, and the large ball can reach the bottom because of it's weight and the momentum it builds up. It depicts how an IF statement has to stick with certain standards and one outcome can only arrive if the value is right.
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