The poem describes a classroom in a slum, where the children have bleak futures. Their faces are pale and gaunt, like "rootless weeds." Though the classroom has maps and pictures of Shakespeare on the walls, the windows show only a narrow street sealed by a gray sky - far from nature and opportunity. The poet urges those in power to open the windows and minds of these children, showing them beauty beyond their foggy slum, so their lives are no longer confined but full of potential.