To transfer complex information properly required immense mental training for the cultivator doing it.
One needed both memory and visualization skills sharpened to a fine edge. It was akin to the discipline of an artist who had spent years honing their ability to recreate what they saw in precise detail. The higher one's cultivation, the more the brain and spirit sense grew refined, which made the process easier.
But even then, without practice, mistakes were common.
Han Yu remembered trying it in his early times as a disciple. He had nearly collapsed after spending a day attempting to record a single illustrated chapter of herb identification. The herbs were similar in appearance, and by the end, he had mixed up the vein patterns on two different leaves.
His instructor, Lin Mei had looked at the result and simply sighed before handing him another blank slip to try again.
