The benchmark for reviews of written texts was provided by Richelieu in the 17th century: "Qu'on me donne six lignes écrites de la main du plus honnête homme, j'y trouverai de quoi le faire pendre."

Over 40 000 downloads per year of Motion Mountain - The Adventure of Physics puts the series among the most widely read physics texts across the world. If mirror sites and torrent providers are included, the number is even higher, though by an unknown amount.

The text is used by curious people of all kind: students, professors, universities, pupils, teachers, schools, and learners of all ages. The text is even used for preparation to the International Physics Olimpiad.

Here is some reader feedback from the old guestbook, now closed due to spam, from emails to the author, and from the internet:

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Recommendations to read the Motion Mountain textbook – none requested or triggered by the author: