Skyscrapers were conceptualized to accommodate the growing population. which architect explained his theory in his essay "the tall office building artistically considered"?

"The Tall Office Building Artistically Considered," is an essay that was written by an architect named, Louis Sullivan. He was a Chicago architect who outlined his own principles for designing tall buildings. In 1986 he completed the Guaranty Building, in the US which is one of his best examples of the early tall office building. 

You look through the lens

Answerthe third and fourth;