They're called <span>Membranophone most Membranophones are drums. </span>
You must look in between the primary colors.
In between blue and yellow, there will be three colors but the one in the middle is the complementary (Green)
I believe F. Scott Fitzgerald wanted to portray Gatsby as a human. When someone is so royally popular, wealthy, and successful it can be hard to see them as anything but those superficial, materialistic things. Gatsby is shown trying to "fit in" so to speak, choosing his words wisely, yet amidst his attempts at formality, he still can't fit the mold that he so desires to conform to.
Perfect fifth because you are going from do to so which is 5 steps apart :) so do to ti would be a perfect seventh since theyre seven steps apart. a perfect octave would be do to do.