Good drawings. Yes as I said we are just saying the same thing differently. To me the second picture is not just upside down it is flopped. It is upside down and backwards. The 3rd image is merely upside down. If you actually take a piece of paper and make that drawing in picture #1 and then spin it round till it is upside down you get picture #3. If you spin it round upside down and turn it over you get picture #2. That is if you can see through the paper.

Dennis