The Mysterious Spheres on Greek and Roman Ancient Coins: By Raymond V. Sidrys. Oxford: Archaeopress Publishing Ltd, 2020. ISBN 978-1-78969-790-2; e-PDF: 978-1-78969-791-9. Pp. ii, 273, illus. £38.00 (paper). Issue Volume 74:Issues 1(2022) (2nd January 2022) - Barber, Peter