In 2008, Matthew Knight thought it would be a great idea to leave disposable cameras in public with instructions to pass it on to another person and how it will be picked up.
He did not know if people would follow the instructions or even where the cameras would end up.
There were 399 cameras released and 31 cameras returned with pictures from all over the world.
What a cool idea.
When people found out about this, they began doing it themselves.
There is a new photography experiment for 2012 that you can take part in.