Grimm's 4 Element Building Set (10216)This 23 piece Four Elements is an heirloom piece! The 4 x 4 cm building block family consists of many different small building set all of the same 2 cm thickness. They compliment each other perfectly and can be combined in many different ways. Earth, Fire, Air and Water are represented in this puzzle by caves, flame, rainbow and waves. The colors are bright and bold. The 4 X 4 cm version is simply stunning and fun for all ages.