The circle, which has about a 64 stud diameter, merely demonstrates that a curved closed loop can be constructed from 1×2 bricks. When constructed of transparent elements, and covered with tiles, that loop would serve as the monorail upon which a “brick built” Santa’s sleigh could fly when furtively elevated to roof level of the winter village.
So the monorail is like the DeVaLUG monorail except the supports are made of trans clear, right? That would be pretty sweet having a Santa sleigh going around but that will take a whole lot of 1×2 trans clear bricks and plates. 😛