Short but clear.
Very soothing, and clear defined. It sends a direct point across and, to me at least, it isn't very "subtle". Regardless, I enjoyed this piece, despite it's short time, but it tends to loop well, and it is certainly calming me down during my studies.
To this I reward a 5/5, despite it getting a 9/10 because I only marked it to a 9 because of length, and that doesn't take too much away from the enjoyability.