Did you get it right?
Compare panels A and B in the county library reading room.

The Answer
The correct answer is: five changes to the clock, lamp, book, plant, and card catalog.
Here is why
- The wall clock shows a different time.
- The reading lamp shade changes color.
- A number on a book spine changes.
- The potted plant has a different number of leaves.
- One card-catalog drawer handle changes position.
Why people miss it
The room stays nearly identical, so small colors, numbers, and shapes are easy to overlook.
What answer did you get before checking?