Final answer:
The Woolworth Building is the name of the square-shaped skyscraper in the photograph. It is important as a key example of New York style skyscrapers and is characterized by its vertical design. It was designed by architect Cass Gilbert.
Step-by-step explanation:
The name of the square-shaped skyscraper in the black and white photograph is the Woolworth Building. It is important because it is a key example of the New York style of skyscrapers that developed in the early 20th century. The design of the Woolworth Building is characterized by its vertical thrust, with every aspect of its composition and decoration oriented upward.
The Woolworth Building was designed by architect Cass Gilbert. It appeared distinctive in relation to the skyline when it was new, standing out among the colossal buildings that now cover downtown Manhattan.