Why can't we walk (read) straight?

We can't walk straight?! Can we read straight then? without jumps around the text....?

Since the movie is too big and it took for ages to upload it, I reduce it (for mobile resolution). Full resolution on vimeo: http://vimeo.com/17083789

I think inspire me to create such an interesting movie explanation! :) It have really nice illustration and easy explanation. Let's plan for semester 2 outcomes! *fire up!