The physical disparity between the ten-cent piece and the five-cent piece in the United States coinage system presents an interesting anomaly. Despite possessing a higher monetary value, the dime exhibits a smaller diameter compared to the nickel.
This design choice stems from historical and practical considerations. The composition and intrinsic value of the metals used in coinage have fluctuated, leading to alterations in size. The smaller size of the higher-value coin provides a tactile distinction for the visually impaired and contributes to ease of use in vending machines and other automated systems.