Kulullin
The great cauldron Aulë made wherein Laurelin had its roots.
Ulmo fared at Manwë`s asking to the great pools of radiance from the overthrowing of the lamps Ormal and Illuin and drew rivers of light into vessels and took them back to Valinor and there it was poured into the cauldrons of Aulë; Kulullin and Silindrin.
Kulullin was set in a great pit and Ulmo threw seven rocks of gold from the depths of the sea in with a fragment of the lamp Ormal. The pit was covered with rich earth Yavanna had devised and Aulë had contrived a fountain springing with the shining water of pure light and so the Gardens of Vána, where this cauldron was, the air was full of health and happiness.
The idear of gathering lights and store it in vats and pools survived and emerged again in relation to the two Trees. There it is told that "the dews of Telperion and the rain of Laurelin Varda hoarded in great vats like shining lakes, that were to all the land of the Valar as wells of water and light"
Related Links.: Battles : War of Shaping Arda.