As we developed Windows, one of the minor decisions we had to make was what wallpaper to use for various internal builds.
These builds always leaked outside of Microsoft, so we knew that the wallpapers would also end up public.
We wanted to try a more elegant tact.
So, knowing that the builds would still leak, we decided to make it fun.
We did not expect what came next.
A dev from Ireland solved it and sent us the answer in 2011.
In the end, we thought it would be a bit of fun for everyone involved.
If you like puzzles, feel free to have a go at it. For a harder challenge, start with one of the green wallpapers.
I'll post the correct solution here later this weekend!