You learned real fast as a dancer how much was the right amount to put on your shoes, because if you didn't put enough on, you were probably going to slip due to the low friction between your shoe and the stage.
Nós, bailarinas, aprendíamos rapidamente a quantidade certa a pôr nas sapatilhas, se não puséssemos o suficiente, provavelmente escorregaríamos, devido à falta de fricção entre a sapatilha e o palco.