For a beloved book with a great title that always feels especially relevant in May, especially if one is a teacher, from The Art of Drowning.

from The Biography of a Cloud / by Billy Collins

We do know this much:
that it billowed white at the mountainous top
and its flat underside was the gray of headstones;
that it slid onto the land and felt its way
over the contours of several western states,
always moving eastward, from left to right,
the way the eye moves over print
as if it were reading the earth with its blind shadow.