Angor told Toby not to wander away from the territory of his ethereal laboratory before he began his work.
There was one more thing he needed to do before actually creating his item, which was to practice multitasking. Usually, any wizard who could calm his mind and meditate could do something like this. However, it was a completely different case when someone wished to multitask while handling extremely difficult alchemy processes.
Here, Angor needed to draw a magic array while forging a space storage item at the same time; both of which required his attention. He had to maintain a stable mana output during the entire course without getting distracted.
However, Angor had help.
While drawing a magic array, he could copy from his hologram projection without having to spend too much of his own effort. A stable mana stream wasn't a problem when he could use the axes of the universe, which meant he only needed to concentrate on the second task—making the space storage item.