Sun's out there, I'm in here

The sun came out today, I noticed it reflected on the wall outside and leaking in through the bars of the window...

One of our conference rooms is partly underground - or at least it always feels that way as you have to go down a flight of stairs to get there. It has bars on the window for security and a building nearby which means that the only outside view is a brick wall. I was in there for a while today, wrestling software, when the room brightened briefly as the sun came out.