After some more time, Pinkie, Rainbow Dash, Rarity and Applejack made it to the library, and Twilight Sparkle explained to them what she already explained to Fluttershy, and everypony went inside to help with the book-finding effort.
It was really painstaking and filled with descriptions of rough wood and cloth bookbinding against smooth pony skin, and the filthy dust and dirt from the former staining the pure coloration of the latter.
After a few hours, Pinkie Pie found the book. It turned out that it was under E.
"Yes, yes, yes! Thank you, Pinkie. And all of you," Twilight praised them, as she levitated the eye-book to herself. "Now stand back, and let me study this."
Twilight opened the book and peered inside. She flung the book across the room in frustration.
"I can't read a single word of this! I'm blind!" She groaned in disgust. "Fine, alright. Let's just... go to the desert. I'm sure the answer is in the desert."
"Uh, Twilight? Why?" Applejack asked.
"Don't question me, let's go! It'll be fun and we'll learn a lesson about friendship in the desert."
Everypony shrugged and followed Twilight out the door.
Spike continued cleaning, but didn't do a very good job, because he couldn't see anything.