The building that I live in goes up to floor 35, but there aren’t 35 floors in the building. Why? Superstition.
You might have experienced this in hotels or office buildings in the United States: there often is no floor 13. That is because 13 is an unlucky number in western culture. In China, the unlucky number is four, because “four” in Chinese (四) rhymes with the word for “death” (死).
This is the bank of buttons in the elevators in my building. What’s missing?
Not only is there no floor 13, nut there is also no floor 4. Or 14. Or 24. Or 34.
So, even though in theory there are 35 floors in this building, in reality, there are only 30. Thanks, superstition!