Adrien nodded; then, quickly and resolutely, he drew a third of a circle in front of himself. "Like that?".

"Yes; well done. Now do that again, but this time, draw a half-circle".

"Ah -- so, I was doing it wrong?".

"No", Valerion smiled, "You were doing just fine; I just want to see how you draw arcs of different sizes and in different positions".

"Oh -- I see", Adrien said.

He grasped the staff again and did as asked; following his mentor's instructions, he kept on drawing arcs for a while. Valerion corrected him only once; for the rest, he let him draw freely, complimenting his work from time to time. Adrien had just drawn a quarter of a circle behind his back when Valerion stopped him, and with a gesture of his hand cleared the floor from all the lines that had been drawn. "Alright", he said with a smile, "the warmup is over. Let us move to the exciting part".