Knowledge and its effect on revolution is a key idea in An Elementary School Classroom in a Slum. As shown earlier, this poem strongly embraces Communism and its ability to transform education and uproot poverty, yet Spender's undying embrace of education stands above everything else as the most empowering and most important influence on the future of humanity. For Spender, the children's minds possess the power of the sun and the ability to clear the fog from the bleak future.