One thing that always strikes me when I go to an Eastern Rite Catholic Church, (recently I have been attending St Elias Melkite Church in Los Gatos, California,) is how much more naturally priest, deacon, cantor and congregation engage with the icons during the liturgy. In contrast, in the Roman Rite, even in traditional congregations, apart from perhaps the crucifix and altarpiece, the choice of art seems to be governed more by the priest’s personal devotion than liturgical considerations, and there appears to be very little engagement with it during the liturgy itself. At best, sacred art provides a decorative backdrop that helps set an appropriate mood for the worship of God with direct engagement in the liturgy itself, which is largely a hands-clasped and eyes-closed activity.
First a quick presentation of different options available to us.
According to my research, the original division in both East and West was more like today’s altar rail, with gaps or doors for processing. The typical “transenna” might have looked as this one at Sant’ Apollinarre in Ravenna, which I understand was restored in the 20th century.