An Opera is a staged drama which is usually sung with no speaking and with a lot of orchestra.
The architects who designed it actually created an "optical" illusion.
An optical illusion is a illusion affecting the visual framework and described by a visual precept that seems to contrast from the real. When we see a thing, the manner in which we see things in a particular territory varies essentially relying upon our angle and perspective. To neutralize it, numerous designers make an optical Illusion and it will invalidate the impact of the distortion.
