This women’s t-shirts is black and on it shows a great scene with many birds and a big tree.
You can see the whole tree from the roots all the way to the tips of the branches and in the tree, you can see some bird cages hanging down and in the cages you find birds but also around the cages there are birds flying free.
Maybe this is a metaphor for life where most of us are stuck in the rat race while some of us are free to do what we please.