being able to point out where in a skyscraper you live or work
There’s a story that the most expensive apartment in Chicago’s John Hancock Center is not the top one, but the one behind the highest X-bracing in its exterior (see gallery). The reason for that not only you have bragging rights of living in a famous landmark, but also because in all of Chicago, you would be able to point out exactly where in John Hancock Center you live.
Residents of Chicago’s Marina City have another way of marking their apartments by leaving out the Christmas lights on their distinctive balconies all year (see right column). I always used the very red lights on the balcony of the neighbor immediately below me (right tower, ⅔ up) to point out where I was living.
Being able to point out exactly where in a skyscraper you live or work just makes it a bit less anonymous compared to skyscrapers without visible marks or signs of life which which force you to count the floors to the number where you live. It allows you to keep some of your individuality while being part of a bigger whole.
When the design of a skyscraper is based on the idea of skydentity, we refer to it as an identitower.
Marina City, Chicago. source: Wikipedia