Something related to the place where Mona Lisa is located. The number of pyramids contained in itself is the answer.

Books related to the number "42"

Use the pattern traced on the right page to dial the left page

I looked at the answer because I didn't understand it at all, but I can't imagine the reason for the answer at all. What is it?

Can you see Mona Lisa? Where is it kept?

color Name

Where did you see the shape of the bookshelf?

Then what is left object?

Books has a number.