1 - Building a Raspberry Pi powered Smart Table
2 - Too much time on my hands
3 - Just for fun. It will basically be a coffee table that tells me the weather for the day, lets me read the news as I eat breakfast, and integrates with my Android phone so that I can reply to text messages.
He was looking for a "zeroknowledge" solution. You need to know a bit about networking for this solution. Also being interested in this, can you recommend any tutorials?
As most of the other comments here, I do believe these are footprints from villages and structures that have worn away with time. The ones with circles were probably areas where huts and other dwelling units were placed.