Coins with illusions

Coin of Israel

A set of coins of 1, 2 and 10 New Israeli Shequels were issued in 1997 to celebrate of 100 hundred years of Zionizm. There are David stars on reverse of coins in form of impossible intersection of two triangles. Coins of 1 and 2 Shequels were made of silver and 10 Shequles were gold.