english: Now, imagine a program where some of those objects are physically heavy and some are light: one is an anvil on a fuzzy rug and the other one is a ping-pong ball on a sheet of glass.
non_english: Zamislite program gde su neki objekti teški, a drugi lagani, jedan je nakovanj na paperjastom tepihu, a drugi je ping-pong loptica na staklenoj ploči.