If you would like to know the reason behind soroban fingering technique, be sure to check part 2 of this soroban series.
/ @theoremofbeethoven
The video is created with Theorem of Beethoven's version of Manim.
/ @3blue1brown
Creator of Manim.
www.jahirulamin.com/
Hand model from Amin's tutorial.
Thank you to everyone above who have shared their knowledge and software to the whole world.
Background music played on a Casio digital piano.