ONE FOR THE DRAFTSMAN --- Brilliant!!

ONE FOR THE DRAFTSMAN --- Brilliant!!   1. Look from left to right from top to bottom.     The rod in the middle does not exist.  2. How many, 7 or 10. Count at the top and then      at the bottom.     3. Is the door open to inside or outside?    4. Round or square?   5. How many, 3 or 4?    6. Is this just one?  7. Rare construction..    8. The centre beam disappears, look from left       to right. 9. 2 or 3?   NO, I don't know how they work… but I think I need new glasses!