If this doesn't mess up your mind, I don't know what will!

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?  

    Look at the top of the door…. Now, look at the bottom of the door. 

4. Round or square?

5. How many, 3 or 4?

6. Is this just one?

7. Rare construction.

8. The center beam disappears, look from left to right.

9.    2 or 3?

I think I need new glasses!