He can cast spells by just visualizing them, making it possible for him to create several variations for several purposes.

Source: https://gamerant.com/isekai-anime-featuring-protagonists-with-fire-powers/

It develops their skills in mathematics by practicing the use of number names and counting in order, helping kids make the connection between written numbers and visualizing quantities.

Source: https://www.chipchick.com/2023/04/heres-an-adorable-raindrop-counting-activity-you-can-make-with-your-child.html

The running back also spends the night before taking mental reps and visualizing himself playing well, a sort of self-fulfilling prophecy powered by melatonin and fueled by the week’s preparation.

Source: https://www.dailynews.com/2023/08/29/uclas-offensive-line-ready-for-all-3-quarterbacks-in-season-opener/

“What had never been done was to make a true film with the painting, the music and the text, and to imagine what Charlotte was visualizing when she was painting… Because the neighbors said they could hear her singing while she was painting.”

Source: https://www.jta.org/2023/01/17/ny/a-new-film-brings-to-life-the-largest-single-work-of-art-created-by-a-jew-during-the-holocaust