Icons are images of Christ, of His angels, of His saints, and of events
such as the Birth of Christ, His Transfiguration, His death on the Cross,
and His Resurrection. Icons actually participate in and thus reveal the
reality they express. In the image we see and experience the wonderful
and holy Prototype.

An icon of Christ, for example, reveals something of Christ Himself to
us. Icons are windows to heaven, not only revealing the glory of God,
but becoming to the worshiper a passage into the Kingdom of God. The
history of the use of icons goes back to the early Church Tradition tells
us Luke the Evangelist was the first iconographer. Orthodox Christians
do not worship icons, but they honor them greatly because of their
participation in heaven's reality
Orthodox Icons