Oh yes, re-reading is breathing.
In fiction: mainly classical novels. Current works I tend to read only once. In maths: apart from texts that I use and re-use for specific topics in my work, there are a few classical expositions that I come back to for joyful "reading", just to appreciate the purity of the outlook. In philosophy/strategy: I have a shelf of classics that I come back to daily, not for study but for continual re-orientation.
PG Wodehouse, Thomas Mann, Joseph Conrad, Heinrich v. Kleist, Novalis, Henry James, Anthony Trollope, Gustave Flaubert, Graham Greene, ...
Paul Halmos, Emil Artin, Andrey Kolmogorov.
Sun Tzu, Laotzi, Zhuangzi, Baltasar Gracian, Angelus Silesius, Martin Buber, Louis Althusser.
Feeling proud of myself, or what I did over the winter and early spring ...
Here's a fresh translation of the Taijiquan Classics, together with commentary, background discussion, and a number of side trips.
https://www.rockymountaintaichi.com/s/Taijiquan-Classics.pdf
the roamer
Lee Fife
Heurism