Intelligent Design (1)

If you are walking in the desert, and you see five similar stones all lined up in a row, evenly spaced, then you know someone has been there and done that. What are the odds that random forces of nature would set not just threee or four, but five rocks to be be in a line? The chances are astronomical.
A similar question:
You see five similar stones all lined up in a row, on Mars. You, as far as you know, are the first person to set foot there. Was someone there before you? Aliens? The analysis is very different now, and it is an important question. Maybe it won't be a face or pyramids, but I'm sure we will eventually find something on mars that looks amazingly artificial. What is the difference?
For the five stones in the desert, we can safely presuppose the existence of human who might have done it. We know other humans exist, and we know they can go to the desert and move rocks. Even if it is unlikely that any individual would do so in such a way, it is far more likely that some individual would, than that the rocks would find their way into a line by chance.
On Mars, we are fairly certain humans have NOT been there before, and we know of no other entity with such volition and intelligence. It is our habit, our natural inclination to assume the presence of another entitity. We are surrounded by entities, but not martians. We can NOT safely presuppose the existence of entities on Mars. We must assume random natural processes, however unlikely.

There is however another possibility. Perhaps the processes are not entirely random. There may be something about the rocks or their surroundings that lend themselves to becoming so ordered. If such a a process could be found, it would significantly increase the chances of finding those five stones in a line.