break ground — to do something that has not been done before
pop-up — (of books, usually children's books) having pieces of artwork fastened to the pages so that when the page is opened, a three-dimensional cutout or object is formed and, sometimes, movement of a picture element, such as a door opening, can be activated by pulling a tab.
down — from higher to lower; in descending direction or order; toward, into, or in a lower position: to come down the ladder.
