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 far, there have been three commemorative coins that the eurozone countries have issued jointly: the first, in March 2007, to commemorate the "50th anniversary of the Treaty of Rome", the second, in January 2009, to commemorate the tenth anniversary of the euro is celebrated with a coin called the "10th anniversary of Economic and Monetary Union of the European Union" and the third one in 2012, to commemorate 10 years of the euro coins and notes. There are €2 commemorative coins that have been issued on the same topic by different member states, two (by Belgium and Italy) to celebrate