[_gd3l]

I'd highly recommend Nassim Taleb's "The Black Swan", that's a useful tool for reminding you how little you know and how little everyone else knows.

Personally, that's a motivator to build a product without being concerned about what all the other products are doing / how they look. It's also a great reminder of the importance of empiricism in some parts of life, which is great to keep in mind with something as simple as debugging your code or doing customer support...coming at a problem like an experiment, from the position of knowing nothing, means you can get to the answer faster (usually) and with more accuracy and precision.