Your pyramid refers to your Pyramid of knowledge. All the knowledge and experiences you’ve accumulated over a lifetime. But why is it a  pyramid? Why isn’t it a cloud, circle or simply a block of knowledge?

Have you noticed as you age that you get opinionated and focused on what you consider right? Over time, you focus on certain things of importance and gain knowledge on them. Your knowledge and experiences grow but on a decreasing number of interests. 

You have little or no interest on many more things than you have interest in. And the knowledge you do have tends to be one-sided. You aren’t looking at the whole picture. Your knowledge is narrowing like the top end of a pyramid. 

This book explains the phenomenon for this and how you can essentially flip that pyramid over so that you can expand your knowledge base and live with the same excitement for everything, just like when you were young.