Cursive Writing
I found the type of cursive I was taught as a youth. I am including it below as an image.

So now when I practice with a fountain pen, I try to make my letters look like this.
The Theory of Constraints
Where should I improve first? Where should I focus? This question has caused people to lose sleep worrying about where to apply limited resources to make a significant improvement to their flow of products or services.
The Belief Pyramid
In his book, Liminal Thinking, Dave Gray highlights the belief pyramid. It is a short book and a quick read. I recommend it.
He describes how we construct models of the world around us (reality) in our beliefs. He says that reality is more than one person can fully experience, so one person cannot understand it all.
Then he talks about how neuroscientists estimate our perception rate at about 11 mbps. So our experience of reality is limited by the range of our experience and what we pay attention too.