Answer:
Im not fully sure, but I think that it is a drawing by leonardo da vinci, and it was one of his ideas for a thing kind of like a helicopter.
The Colors Orange, Violet, and green are equally Spaced from each other on the Color Wheel, they are called (secondary) colors.
In the Lord of the Rings, to make Elijah Wood (Frodo) look smaller, they made him stand/sit in a way where he is farther away, but you can't tell he's farther away because it is an illusion.
Tetravalent
We have already seen an example of how a covalent bond can form between two hydrogen atoms producing molecular (H2) as opposed to the atomic form of hydrogen. ... As in all its compounds and its elemental forms, carbon is tetravalent, which means that it always forms four bonds.
