Pope Shenouda III
Our worship is not worship with the intellect only. The senses also act; they are affected and they affect the feelings of the soul. An example to illustrate this: When we pray we look up although God is everywhere. But looking upwards evokes in our hearts spiritual feelings which give more depth to our prayer. The same applies to facing the East. The Lord Himself, on more than one occasion, looked up, although the Father is in Him and He is in the Father. But looking upwards has a certain significance.