under the metro station

There was an open doors school day today at my old school. I went there to see some friends and old teachers. The school felt so small compared to the one I'm in now. But it was a fun visit.

I saw these pictures on the walls of the tunnel that goes under the metro station. I'm not sure why they are there but they look like some school kids have done them. They looked nice so I wanted to take a picture of them.