Some cool posters from back in the day

diymirage said
No, it's the same basic idea of an airbrush

Next time you get a pop from a fast food restaurant, get a second straw
Put it at a 90 degree angle and blow throw it

Your breath passing by the second straw will create a vacuum which will suck up the pop and spray it

That's how this works

Agreed. Try holding two sheets of paper about 1" apart and parallel to each other. Then blow down between the sheets of paper. The sheets will come together. That is Bernellis Principle. As air speed increases, pressure decreases. It's what makes airplanes fly.