text: According to Garvin, "As a rule of thumb, you can discern things in a digital image 3 times bigger than the pixel size." also, "So, if there were objects in this picture like airplanes on thr ground or Egyptian-style pyramids or even small shacks, you could see what they were."! In the picture of The Face on Mars if there was anything that could be making this landfrom you would be able to see it.