Sometimes we forget how important empty days are, how sometimes it can be so important to do absolutely nothing.
A day, a single day where you don't push yourself to the limit or are not pushed by others, may seem like a lost day. But it's not!
The most valuable thing you can do for your mind, from time to time, is to let it rest, wander, live in the changing light of a room over time.
I can't remember my last empty day.