Andrei Rublev's The Holy Trinity

Here is Revd Beverley Mason's meditation on this icon. Imagine sitting in the beautiful darkened St John's Upper Norwood with just a few votives burning before the icons on the altar as we did last night with Allegri's Miserere playing.
This image of the Holy Trinity is based on a mysterious episode in the Old Testament in which God appeared to Abraham and Sarah in the form of three angels (Genesis 18:1-5). The angels depict the manifestation of the Godhead - reading from left to right, they represent the Father, Son and Holy Spirit.
Allow your eyes to draw a cricle along the outer contours of the angels. This is an endless circle of perfect unity and loving communion. Notice how the three figures resemble one another and notice too their inherent unity: One God in three Persons who complete one another in an endless circle of loving communion. At the centre of this Circle of Love is a chalice, which signifies the mystery of the Incarnation and the life-giving blood of Christ. The icon is telling us that at the heart of divine communion is the desire for the redemption of humanity!
Within the Holy Circle, a place has been left for you! The Holy Trinity is drawing you into itself - inviting you to sit at the table - to participate in the communion and to take the chalice.
You are God's desire and God is drawing YOU into his Circle of Love.
Can you find your place within the Circle?
Will you let God draw you to your rightful place within the Circle of Love?
Holy God,
Holy Strong,
Holy Immortal,
Have mercy on us.
(The Trisagion, Liturgy of St John Chrysostom)

Interestingly during her talk most of us thought the central figure was the Father but if you think about the blessing hand it must be the Son. The sacrificial Lamb is also suggested in the chalice. The tree refers back to the Genesis story both Abraham and Adam and forward to the Cross.