cogdogblog posted a photo showing the inside of a lift, with the fourth floor missing from the controls:
As you can see in the photo, floor 4 is missing from the elevator controls. This is due to superstition – in Chinese, the word for 4 sounds like the word for death.
From what I’ve seen, the way the number 4 is treated in China is a little like the way the number 13 is treated in the West.
Most buildings I’ve been into do have the fourth floor. Most people I’ve met don’t pay too much attention to the fact that the number is supposed to be unlucky.
Of course there are always some people who treat it more seriously and in general Chinese people are more superstitious than those in the West.