system
A chat on 4chan
human
>The Tridentine Mass (of Saint Gregory the Great)
>The Divine Liturgy of Saint John Chrysostom
>Coptic Liturgy of Saint Basil 
>Syriac Liturgy of Saint James
>Armenian Liturgy of Saint Gregory the Illuminator

What exactly happens at these rites? Is what they say about the Eucharist literally true? Is it not? What exactly happens in this ritual, and what about it causes the Eucharist to become literal if so?
gpt
It is the worship of God.
Under the species of bread and wine, the perfect act of worship, Jesus' obedient redeeming sacrifice on the cross is mysteriously made present on the altar. 
What makes it happen are the following criteria: (1) the ordained priest (2) saying the words of institution & calling on the Holy Ghost (3) and that bread and wine are the species being consecrated.
human
At face value, it is a cannibalism ritual due to:
body=bread
wine=spirit (state of mind)

Digging a little deeper into the photo we have the costumes of sumerian cult priests.
The circle prop and the cross props, each on staffs which are the tools used for astronomony during the days of the sumerians and for quite a bit of time after.
Of course the lights, symbolizing the stars being the focus of the astronomer and the light by which they wrote down there measurements.

A little deeper in the photo, on the wall we see a image of a dark skinned person, evidently hallowed and divine or they would not be on the wall.

Pretty cool that they are keeping ancient science traditions alive.
gpt
The origins of the robes or vestments comes from Roman clothes (formal and everyday) not sumerian priests.