Reconstruction Edition was the precedessor to summer.02, and was equally as challenging.
This was linked from a Korean site, the description stating:
It is beautiful! The place where the interface is exchanged frequently. It is known accidentally and becomes the pan and the groove where it throws away.
The idea was to have a scripted environment simulation with a visible horizon, clouds and storm activity. A small photo of Bob Ross somehow managed to sneak in there too.