Then there are others who are without any media distractions, travelling alone with nothing to do. Observe them. You can tell a lot about a person by looking at where they are looking. If their eyes are constantly scanning the room, their brains are active, they are receptive to their surroundings and are alert. Perhaps hoping to meet the gaze of another interested individual. Generally, if you're looking around you or at people, you're opening yourself up for conversation and subconsciously inviting friendly talk. If your gaze is down and away, it's the eye language equivalent of "leave me alone". Of course these are all variable depending on the situation but I'm just talking about general observations here.
As I was travelling in the train one day, I caught myself becoming a victim to this observation. I'm usually either reading, scanning people, reading them or when I'm tired, look away in a corner and try to fall asleep. What was unusual in this instance was that I needed to use the toilet. First thing I did was try to identify where the nearest toilet was without getting up. It was at the end of the corridor. Next I determined whether or not it was vacant without getting up so I studied the light switch above it. I couldn't really tell if it meant vacant or not.
What I did notice was 2 other ladies sat uncomfortably near the toilet with quirky movements. It told me they were waiting for the toilet. Soon I realized I was no longer doing the things I would normally do, lie in a corner or falling asleep. I was constantly checking for the toilet to be available, scanning the area, seeing if the ladies had already had their turn. So much so that my body had tilted itself to a unusual position, my head leaning to the side giving me full vision of the situation in front of me. This got me thinking. Would I have been in this position if I hadn't needed to use the bathroom? No. It was an uncomfortable position, with my head tilted to one side and heck why would I be staring at the aisle in front of me for? At which point, I got a little subconscious because I thought the ladies in front caught my eye and they must be thinking the same thing, "this guy needs the loo". Hah!
Naturally I tried to fake it and look away returning to a more comfortable position. But it was difficult to go back to doing something more casual when you really needed the bathroom. I soon found myself back to the original leaning position, with my eyes on the toilet scenario.
Have you ever had a conversation with someone and suddenly their eye darts to something behind you and eventhough he/she is still talking, you know they are now focussing on something else? More often than not, you'd be so intrigued by what has intrigued them that you too will turn and see for yourself. Our eyes can be so revealing sometimes.
This ends my observation for "You look at what you want". Your eye looks are directly connected to your brain and will look at what you are currently interested in. So I guess this is why we look at people's faces when talking to them (mostly eyes) to read them because it is shocking what you can find out with their gaze and direction.