Ramstead, M. J. D., Sakthivadivel, D. A. R., Heins, R. C., Koudahl, M., Millidge, B., Da Costa, L., Klein, B., & Friston, K. J. (2023). On Bayesian mechanics: a physics of and by beliefs. Interface Focus, 13(3):. doi:10.1098/rsfs.2022.0029.