There are four stories to the outer façade, each containing its own unique details. The first level of the Colosseum has the largest arches, numbered gate entries, and doric pillars. The second level has Ionic pillars and the third level has Corinthian pillars. The style of the pillar has increasingly more detail and embellishments going from bottom to top, which represents the rising power and achievement of the Roman Empire. The forth level of the Colosseum is actually the tallest and most simple, containing only pilasters, of faux half pillars. It had to be reinforced to support the Velarium which is the large canvas overhang that covered the spectators from rain.