The Pictured Rocks cliffs are continually reshaped by erosion from wind, water, and ice, so no two views remain the same. In the 20th Century, two notable examples of this change were the collapse of the Grand Portal Arch in 1900 and the fall of the Chapel Rock Arch in the 1940's. Chapel Rock was once connected by an arch, and today only the white pine root connecting the two rocks remains. Portions of Grand Portal Arch continue to fall into the lake. According to the Munising News of September 22, 1900, the roof of the Grand Portal caved in on Sunday night and disappeared into the sea. The cavity had been large enough for a good-sized steamer to enter and was perhaps a hundred feet or more high above the water. Large chunks of rock had often fallen from the roof, and the portal itself had been formed in this way. Its support had been weakening, and a heavy sea was presumed to have caused the destruction. A berry picker camped within a half mile reported that when the huge mass of rock fell, it shook the ground enough to upset dishes on his camp table. Other cavities are being formed in the rocks, and after many years other grand portals may be created by the action of the water, though that could take centuries unless a huge mass of rock breaks away at one time.