What is the difference between a balance ball and a balance chair?

This is a video of a conversation between the inventor, Hans Christian Menscholl, and Balance Lab's president, Sakamoto.
We asked the inventor of the Balance Chair some common questions.

In this video, we ask the question, "What is the difference between a balance ball and a balance chair?"
Recently, it seems that some workplaces use balance balls to sit on, so we asked the inventor of the balance chair what he thinks is the difference between a balance ball and a seated chair.

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