console.log(self.journal);

Usually it's about using my eyes, sometimes them ears can be helpful too.

We have a goal of being a so-called 'green company', meaning we don't print stuff unconsciously, we don't use paper plates and cups or plastic service, and we hit the light switch in the room if we're the last ones leaving it at the end of the day. At least we're supposed to. We probably print out way too much, and the lights seems to be really hard to turn off.

Which brings me back to affordance. The lights being on in a room is a clue telling me there's still someone there! However, as I know people don't care about the planet etcetera, I have to go check the room—and, of course—turn off the lights if it's empty. If the lights were off, I wouldn't have to go check it out in the first place.

Noise

Sound is more subtle. Quiet offices can mean several things. One possibility is that it's empty. Another one is that there's people in there concentrating in silence. There's no way to be sure, really. Noise can be better, but people have been known to not turn off their computers and leaving the music on for the rodents' weekend festivals. The only certain clue here is hearing my colleagues talking.

You probably already drew this conclusion, and yes—I usually end up going through all the offices looking for overworked colleagues. Being a little bit more aware to the small details could save a colleague some minutes. Every second counts if your entire evening was dedicated to work.

On my way out

That is why, If I'm not the last one leaving, I don't close the door which cannot be locked from the outside. If I leave the door closed, the last person leaving would have to walk up to the door and check whether it's locked, as opposed to the obvious visual clue the open door gives. Worst case scenario: Door stays closed but unlocked.