January 17, 2011 / Misc / 0 comments
The author says:
The round shaped coins must have a lot of benefits that other figures such as a triangle or a square don’t. Also, non-rounded coins may have many demerits. Aside from those, travelers and other people who are not accustomed to the currency would be able to easily remember how much each of these coins is (as long as she knows how to read pie charts).