article_snippet: Scroll down for video .
article_snippet: Settling in: Mark Zuckerberg is pictured above having a meeting in an office-cum-ball pit, which was seemingly crammed with plastic playthings as a first-day prank .
article_snippet: One Facebook employee posted an image of Zuckerberg and Facebook Chief Technology Officer Mike Schroepfer meeting in one room, which had been filled with plastic balls - seemingly a first-day prank.
article_snippet: The warehouse has been crammed full of art pieces by Bay Area sculptors and painters, like the above .
article_snippet: An army of Instagram stars was unleashed on The building, and captured The building quirky stairways, unusual paintjobs and sculpture pieces made by Bay Area artists.