William held his right hand in front of his face while scanning his memories for scenes where he may have done the same. His Vision Talent was currently disabled because of the school's Dimension, but it had a Mana Mode that allowed him to perceive things differently based on their Mana Reserve.
Coupled with a 96 times improvement to his vision, William could see his own Mana Circuits without the need of a special Spell like the one that Professor Tenningbrew showcased to the class.
William located an ideal memory of himself from when he was back in the Mortal Realms, a few days after he had just improved the Vision Talent to X-Rank. Back then, he didn't fully understand that what he was looking at were Mana Points and Mana Veins, so it wasn't a big deal.
Now, however, it was a gamechanger.