Shields appear distinctly different when viewed from different distances - applies to units such as the shields of Pedites extradanrii, the hastai smantaci (sp?) spearmen, and the shields of sacred band infantry.
Example:
https://img364.imageshack.us/img364/...ror1ht0.th.jpg
https://img254.imageshack.us/img254/...ror2ew3.th.jpg
