idea from hazel

I was talking to Hazel about my idea to cast and preserve random areas of Manchester, to make the selection of areas a random process I am going to throw darts at a map of the city and then use these areas.  However, Hazel did point out that I would have to come up with a set of rules before hand as what would happen if the dart landed on a buildings roof or in the canal.  Therefore, I am going to have to look into the idea and finalise it before I start the process of picking the random areas.