Each step along the way towards higher mobility I was amazed by the advantages afforded by my new form of locomotion and for a while was completely content with not progressing beyond that level.  Once I found out about something better, and convinced myself that I would actually like it, I had to have it: figuring out how exactly to get my feet underneath my body, getting my parents to buy my rollerblades, learning to ride a bike without training wheels, and that awful six months with a driver’s permit.  If I never saw a car, I probably still would not think that I needed anything other than my bike, but I guess that’s how it works out, see something new and fantastic and what you have currently is no longer exciting.