Back when I was really young I used to go to the mall with my friends.
We used to enjoy hanging out and shopping. The mall in our local area at the time was unlike any general mall in the country as far as I knew. They had these really upscale and beautiful water fountains that went so high up in the air. Then they had a really good central heating and air conditioning set up too. The air vents were both in the floors and in the walls. At that time seeing air vents in the floors was pretty unusual. What was even more unusual was the fact that if you looked inside those air vents of the central heating and air conditioning system you would see pennies down there! People used to throw pennies in the fountain to make a wish. But they were also throwing pennies down the air vents that were in the floors! This was pretty messed up when I think about it now as a full grown adult. The pennies down in those air vents could have eventually caused some serious damage to their central heating and air conditioning system unit! I would imagine that it was most likely a commercial heating and air conditioning unit because of how huge this mall was. A general heating and air conditioning system would have never covered this entire building. Unless they had several central heating and air conditioning units. And I do not think they did.