I work at a movie theater and I pour soda all the time. I put the cup on the grill of the soda tower, it slides down and hits a tab, and the soda tower dispenses soda just until the soda reaches the top of the cup. The soda DOES NOT spill over. The tower just KNOWS that it has to stop. So I thought maybe that the slant of the grill, the shape of the cups or the weight of the beverage had something to do with this ability, however I can assure you that none of these are factors. I've tested a variety of cup shapes and weights, and have applied varying amounts of force to the tab on the soda tower, and still, the soda has always stopped coming out just before the container would overflow. Although actually I tried filling up a bowl one time and the soda overflowed… But the soda tower is nonetheless incredibly mysterious and I would be so happy if someone could please explain how it knows how full my cup is. Thanks so much.

um when you tell it what cup your using, it knows the amount of liquid to put in the cup to fill it!

same with those coffee machines, that don't spill the coffee, it knows the cup size, and how much drink per size…