What do you think about a time limit? Suggestion: limit to three pieces per artist per level per 10 hours. That way, if the Gridcosm is slow, one artist could finish it in a day, but still give everyone else at least 20 hours to contribute.

I think it's a great technique to do two or three pieces at a time, as long as there are some open slots left for others.

Let's play! ...e