Euro coins were designed to be identifiable by ( size + edge pattern ) but that is too complicated when under time pressure. And then there are other gaffes su

Euro coins were designed to be identifiable by ( size + edge pattern ) but that is too complicated when under time pressure. And then there are other gaffes such as the 2 Euro being physically almost identical to the Turkish 1 Lira. I don't know why the opportunity wasn't taken to use distinctive shapes and colours.