Answer:
With a halo of water and a tongue of wood, stone as skin long I stood. What am I?
What kind of room has no doors or windows?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.
I tremble at each breath of air, and yet can heaviest burdens bear. What am I?
I can be simple or I can be complex. I can be found in this riddle or in everyday life. I can be shapes or even colors.
What is always coming but never arrives?