U . S . officials banned the aircraft from a semicircular section of downtown Chicago's densest concentration of tall buildings.
2.
The four detached side spires were kept, but the large central dome was eliminated and replaced with a system of four semicircular sections, separated by transverse arches.
3.
The performance space of the Roman circus was normally, despite its name, an oblong rectangle of two linear sections of race track, separated by a median strip running along the length of about two thirds the track, joined at one end with a semicircular section and at the other end with an undivided section of track closed ( in most cases ) by a distinctive starting gate known as the carceres, thereby creating a circuit for the races.
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