What is the theme/message of the poem "Playground, By Laurence Alma-Tadema?

I've never read this poem, but I think I can help you figure out this one. This is a technique my AP English teacher taught me. When you read a poem, it's usual telling a story that is a metaphor for something. Say for instance, the poem "The Road Less Traveled" by Robert Frost. Obviously, it is about a man/woman standing at a crossroads wondering which road to take. But on a deeper level, it is about choices and how as humans we are bound to be in a situation where we may have to make tough decisions. It's a simple formula. "Obviously, the poem is about this...but on a deeper level, it is about this.." Use that, and I'm sure you can figure it out and feel good about yourself for doing it yourself! :)