Focus is a Curious Thing
If we really attend to the act of focusing, it can be noticed that there isn't a focuser and an object of focus. There's just a single continuum of focus.
This truth is glimpsed only briefly - before our sense of self seeps back into experience.
Sometimes we all have trouble focusing on something. But how can we struggle with such a simple task?
Even the feelings of mental fogginess and waning focus can be clearly experienced.