photo of the Ensign Peak Monument taken on September 22, 2011
"And the end shall come, and the heaven and the earth shall be consumed and pass away,
and there shall be a new heaven and a new earth."
Doctrine and Covenants 29:23
The square is a symbol of earth and the four corners, the circle is symbolic of heaven. This transition or point of contact from earthly ways to spiritual ways is seen in this pillar monument on top of Ensign Peak. It also represents a place where earth meets heaven.. since this was a location that the early Saints where given the temple endowment.