To save energy.
Have sensors that “follow” people and where they are in the building, and only turn on the light where they are and the immediate surroundings. Can also be smart and predict ahead, for instance when someone enters the elevator and pushes a floor button, the system can predict when he’ll arrive and light up the corridor a bit in advance. All the time monitoring all corridors and elevator behavior to optimize for all data gathered.
It would be very useful to immediately be able to highlight something you read, and have it in an online library with a link to the original document.
Have an iPhone extension (and comparable solution on Android phones) you can use when you read something and would like you can invoke when you selected a text in a document that has a URL. When invoked the extension should save the selected text with a link to the original document URL in your own online repository that you can access anytime on the web or with the app of the extension.