just the other day on a ride back from a 2 day canoe trip i was basically doing the noticing exercise and i began seeing all kinds of faces and such. its happened many times before but this time they were clearer. like movies in gray scale. i saw a guy fly fishing on a river, people playing volleyball and of course numerous faces that pop up and then fade away. they were all very clear. i am curious as to why i see this kind of imagery sometimes and other times i don't see anything.