Very often we fit ourselves into boxes and labels and restrict our thoughts to whatever is inside, but we tend to forget to look outside the boxes and to see what things there are that we can too find ourselves around.

And that makes for a more interesting life than one just focused inside the box.

There's a concept in Taoist philosophy that resonates with me. The concept of wu-wei.

A video by Einzelgänger puts forth an interpretation that goes along the line of: we often worry too much about how to present ourselves that we forget to be ourselves.

Another interpretation goes in the sense of: we often face our issues or problems with our preconceptions and assumptions of how things would turn out, and because of this we face our issues by seeing them as we think they are, rather than what we see them as.

We go into the issues by thinking that we should act in certain ways to effect certain outcomes, which sometimes is counterproductive in trying to get the outcome we want.

And to see things as what we see them as, we need to let go of our egos, our preconceptions, and to react to them not instinctively.

Not too sure if it is similar to what you mentioned, but it is also about living in the moment, just without the preconceptions that can cloud your opinion of what you see.

There's a concept called Shōshin in Zen philosophy, seemingly related to this childlike joy and wonder; it talks of letting go of preconceptions and for people to become open and eager, as a beginner would be.

Becoming adults we tend to see things in a different light from children would; we would see things as how we think of them, with our past experiences, rather than for what they are.

So with shōshin, normal, usual, mundane things or events can even seem to be wonderful, new and interesting. It's not that difficult to change a little of one's mindset bit by bit, and things will start to change in a bigger scale.