It looks like a shaft for a distillation tower. Great picture.

i see mao tse tung having a family picnic next to door three, and mickey mouse in the blue room,,no wait ..thats definitely minnie and shes sewing a dress or a skirt or something and then on the hallway theres a real clear image on schwatzennegger taking the oath of office in a silver suit and a cigar in his mouth. everyone else see this??