The answer lies in the type of rock upon which the tree is balanced. It is part of the Pictured Rocks National Lakeshore on Lake Superior, which lies between the city of Munising and the township of Grand Marais. Part of this National Lakeshore (the first so designated in the US, back in 1966) which ranges for 42 miles is 15 miles of colorful sandstone cliffs. Sandstone erodes.