The idea of practicing tai chi was growing in my brain like a tumor for about two years until the end of last year, when I finally made a move and started studying the most misperceived martial art in the world. Yes, it is a martial art and yes, it is misperceived.
An old master once said to his young student: "You are younger and stronger. I am old and weak. How is it possible that I still beat you everytime?"
In this world, we all grow up with the idea that we can't beat someone or something if we aren't stronger. We fight force with force. Sometimes, when we find ourselves weaker and instead of looking for a way to succeed despite our weakness, we walk away. Tai chi lets you overcome your weaknesses.
When I tell people that tai chi is a martial art, most ask how it is possible to defend yourself with slow movements. The answer is that you don't. What most people don't know is that tai chi has a fast component that many schools teach to advance students. Every slow movement can be applied in a situation of self-defense and obviously, it is accelerated.
Why slow movements? I find that question to be like the question "What is the meaning of life"; every answer is your own. Personally, those slow movements are a training for the mind. My master says that slow movements help your coordination.
One day, I would love to be practicing tai chi in front of thousands of people and have them follow me, but I am nowhere close to that right now. In fact, even in 20 or 30 years, I still don't see myself ready for something like that. But you know what? I'll keep practicing until I reach that level and go beyond.

Photo taken from this very interesting article: Tai Chi: the ancient art of going with the flow.