In the original plan for the new Headquarters, a tiny room had been provided as a place dedicated to silence, where people could withdraw into themselves, regardless of their faith, creed or religion, but Dag Hammarskjöld wanted something more dignified. In his efforts he was supported by a group, composed of Christians, Jews, and Moslems, the "Friends of the UN Meditation Room", who combined their efforts and provided the money for a room worthy of a world organization.
Mr. Hammarskjöld described it as "...a meeting of the light, of the sky, and the earth... it is the altar to the God of all.... we want this massive altar to give the impression of something more than temporary...".
So, in the middle of the room we see a symbol of how, daily, the light of the skies gives life to the earth on which we stand, a symbol to many of us of how the light of the spirit gives life to matter.
We may see it as an altar, empty not because there is no God, not because it is an altar to an unknown god, but because it is dedicated to the God whom man worships under many names and in many forms.
Of iron man has forged his swords, of iron he has also made his ploughshares.
https://visit.un.org/sites/visit.un.org ... ochure.pdf
https://www.un.org/Depts/dhl/dag/meditationroom.htm