"Um - excuse me, Valerion, I was just thinking - I am sure I have heard of sorcerers drawing spells on their hands; if these circles I drew here are too small, how did they...?".

"Oh, yes - that is a more advanced use of magic", Valerion said as he found his chair again. He adjusted his robe as he placed himself in the seat.

"So bigger circles are easier than smaller circles? I would have never guessed", Adrien remarked, slightly raising his shoulders.

"No, no - it's not that bigger circles are easier; it's that...it is easier to channel magic through shapes that are proportional to the body of the caster, since the motions required to draw them are simple and natural", Valerion explained.

Adrien listened in silence; then, he nodded emphatically, and smiled. "That makes sense. So, let me see...". He extended his right arm, then quickly described a wide circle in the air, its contour delimited by his fingertips. "Would this work?".

"Yes", Valerion smiled, "a circle of roughly the same radius as your arm would work well for a beginner".

"I see", Adrien nodded again. "Can I try some more?".

"Of course -- do you need more chalk?".

"Yes, please - thank you", Adrien said.