Euro coins edge of the €2 coin also protects it from counterfeiting. Euro coins were designed in cooperation with organisations representing blind persons, and as a result they incorporate many features allowing them to be distinguished by touch alone. In addition, their visual appearance is designed to make them easy to tell apart for persons who cannot read the inscriptions on the coins. The coins increase in size and weight with value. Of the eight denominations of euro coins, the three lowest denominations are small, resemble copper in colour and are quite thin and light. The next three denominations resemble gold in
2 euro coin all states have issued their own commemorative coins except for in 2007, 2009 and 2012 when every then-eurozone state issued a common coin (with only different languages and country names used) to celebrate the 50th anniversary of the Treaty of Rome (1957–2007), the 10th anniversary of the euro (1999–2009) and the 10th anniversary of euro coins (2002-2012). Eurozone-wide issues do not count as a state's two-a-year issue. Germany has begun issuing one coin a year for each of its states (the German Bundesländer series which will take it up to 2021. There are several types of Commemorative €2 Coins: So