In 1411, when Europe was experiencing the Renaissance, Rublev painted an icon for the Trinity Monastery at Zagorsk. 

Icons have a deep spiritual significance, particularly in the Orthodox Church, and are  seen as windows out of the realities of the everyday into the realms of God.  They are painted prayerfully often with fasting, and frequently their real significance is appreciated as others look and meditate on them

This icon is based on the story where Abraham receives three visitors, but is seen to symbolize the Trinity.  The three figures are sitting around a white table on which is placed a golden dish containing roast lamb:  this helps us think of an altar at Communion.  Each person of this Trinity has different clothing and the three figures are all looking out towards us.  On the right the Spirit has a blue garment, calling to mind the sky, over a robe of green: so we are reminded of the Spirit moving over the deep, and of Creation.  The Son, in the centre, has the deepest colours with a thick garment of reddish-brown which calls to mind the earth, and is covered with a blue cloak symbolizing heaven.  So we see that Christ brings heaven and earth together.  The Father, on the left, has what appears to be a multicoloured robe that looks different as the light changes.  It is as if we cannot describe the Father, because we have not seen Him, but He fills the universe.  The gold which is seen in the angels' wings, the chairs, the roof of the house and the chalice can be seen to represent God's power and majesty, but His glory is shown by the white light all around the figures and on the holy table.  God the Father raises His hand in a gesture of blessing of His Son, both in the person on the icon, and in the chalice;  the hand of the Son moves this gesture on towards the Spirit, so moving round the table and showing how the three people of the Trinity are working together.

We are invited to join them: the space at the front of the icon is for us.  Looking and thinking about this icon can speak to us in many ways, some of which are difficult to put into words.