“Yes, and that’s the day he burned up in there. As soon as he got sunlight, he lit the hay with the monocle he wore as he composed these books.”
Hannibal further acquainted his tutor with Lecter Castle with a tour of the grounds. They passed through the courtyard, with its big block of stone. A hitching ring was in the stone and, in its flat top, the scars of an axe.
“Your father said you measured the height of the towers.”
“Yes.”
“How high are they?”
“Forty meters, the south one, and the other is a half-meter shorter.”
“What did you use for a gnomon?”
“The stone. By measuring the stone’s height and its shadow, and measuring the shadow of the castle at the same hour.”
“The side of the stone is not exactly vertical.”
“I used my yo-yo as a plumb.”
“Could you take both measurements at once?”
“No, Mr. Jakov.”
“How much error might you have from the time between the shadow measurements?”
“A degree every four minutes as the earth turns. It’s called the Ravenstone. Nanny calls it the Rabenstein. She is forbidden to seat me on it.”
“I see,” Mr. Jakov said. “It has a longer shadow than I thought.”
They fell into a pattern of having discussions while walking and Hannibal, stumping along beside him, watched his tutor adjust to speaking to someone much shorter. Often Mr. Jakov turned his head to the side and spoke into the air above Hannibal, as though he had forgotten he was talking with a child. Hannibal wondered if he missed walking and talking with someone his own age.
Hannibal was interested to see how Mr. Jakov got along with the houseman, Lothar, and Berndt the hostler. They were bluff men and shrewd enough, good at their jobs. But theirs was a different order of mind. Hannibal saw that Mr. Jakov made no effort to hide his mind, or to show it off, but he never pointed it directly at anyone. In his free time, he was teaching them how to survey with a makeshift transit. Mr. Jakov took his meals with Cook, from whom he extracted a certain amount of rusty Yiddish, to the surprise of the family.
The parts of an ancient catapult used by Hannibal the Grim against the Teutonic Knights were stored in a barn on the property, and on Hannibal’s birthday Mr. Jakov, Lothar and Berndt put the catapult together, substituting a stout new timber for the throwing arm. With it they threw a hogshead of water higher than the castle, it falling to burst with a wonderful explosion of water on the far bank of the moat that sent the wading birds flapping away.
In that week, Hannibal had the keenest single pleasure of his childhood. As a birthday treat Mr. Jakov showed him a non-mathematical proof of the Pythagorean theorem using tiles and their impression on a bed of sand. Hannibal looked at it, walked around it. Mr. Jakov lifted one of the tiles and raised his eyebrows, asking if Hannibal wanted to see the proof again. And Hannibal got it. He got it with a rush that felt like he was being launched off the catapult.
Mr. Jakov rarely brought a textbook to their discussions, and rarely referred to one. At the age of eight, Hannibal asked him why.
“Would you like to remember everything?” Mr. Jakov said.
“Yes.”
“To remember is not always a blessing.”
“I would like to remember everything.”
“Then you will need a mind palace, to store things in. A palace in your mind.”
“Does it have to be a palace?”
“It will grow to be enormous like a palace,” Mr. Jakov said. “So it might as well be beautiful. What is the most beautiful room you know, a place you know very well?”
“My mother’s room,” Hannibal said.
“Then that’s where we will begin,” Mr. Jakov said.
Twice Hannibal and Mr. Jakov watched the sun touch Uncle Elgar’s window in the spring, but by the third year they were hiding in the woods.