Flying through, I'll drop you a couple of quick thoughts.

Cybershock by Winn Schwartau almost gets it.  Winn's a hacker, he knows hackers.  He knows it's not about swiping money by the cent or jacking the Pentagon homepage.  It's about solving problems, fighting against a machine to prove you're better than the designer.  So some hackers start causing trouble.  And some of it's just for fun.  But hacking isn't about causing trouble for people.  That just happens.

While I'm here, I'll drop a few practical tips on physical hacking.  You want to get somewhere that looks hard to get to, but you want to get there quickly, without getting caught, and without getting killed.  I can't help you with the getting killed, you're just going to need a lot of physical skill.  All good hacking takes place at night.  Get used to it.  

College campuses have a lot of opportunities, especially for students.  Security isn't always tight, and students often have access to buildings 24.  You should get a lot of foot traffic, so you can have a big audience if you find a good location.  And schools have issues that students care about, in case you want to make a statement.

Hotels often have few people wandering around, and nobody will ask you what you're doing there.  Rent a room, and the building is yours.  Check into a five-story or taller hotel, and take the stairs.  At the top floor you'll probably find roof access.  If you're lucky, and I've been lucky before, some merking maintenance man forgot to close the padlock.  The roof is mostly invisible, so get your supplies up there quick and do your work up there.  If you can make a big 3d model, just stand it on the roof and get out of there.  Or you could drop a banner down the side of the building.  I'm sure you're creative.

When I have more time and more tricks, I'll throw them at you.

Life Hacking

Jumping in and getting your hands dirty. Editing .ini's, operating from the command line, this is where it starts. Before long you're nosing around in someone else's system, finding their security holes and alerting them. Or just leaving your mark and letting them figure out how you did it. I call it diving, but most call it hacking. Or they used to.

Before the net was around, hackers had to hack something. So they hacked buildings. It's ancient history by now, but apparently it started at MIT. The twinkies wanted to know their world, so they crawled the tunnels, climbed the roofs, and saw. And they called it hacking. They left their marks, most often on top of the great dome. They showed the world that they knew the campus, and they were smarter than the security, and they were ingenious. Most of their hacks could also be called installation art. In unusual places.

Maybe you've realized that the physical world is an ugly place, an impersonal place, a corporate place. In cyberspace, your voice is determined by the number of people who hear you, through word of mouth. Anyone can go anywhere in an instant, to find their favorite content. In the physical world, the people with the most money get to shout the loudest, because they can pay for bigger ads, bigger buildings, stronger radio signals. Hacking is even more important in the physical world, because it may be the only voice you have.

You need an idea. It needs to get people's attention, and it needs to be clever. The peds who see it need to know that you put a lot of effort into it, so they'll pay more attention to it. Anyone can ignore spray paint on concrete in an alley. When you put it somewhere hard to get to, say thirty feet in the air, they know you must care about it. Or when your hack is clever, they have to think about it. Peds don't think enough anyway, so give them something to think about. And don't use spray paint unless you've got a damn good reason. Just like in cyberspace, 3d gets a lot more attention than 2d. If you've got a message, don't just shout it out, that's too easy to forget. You've got make them think about so it stays in their mind. You've got a voice now, but people can ignore you in real space just like they can ignore you in cyberspace, if they don't care about what you're saying.

Later maybe I'll give you some practical tips on the getting the message out, instead of just telling you what to say. If you can't figure out what to say on your own, just shut up.