Visual effects, sometimes referred to more broadly as CGI, have always been a cornerstone of “movie magic” since their initial development in the late 1960s. While action blockbusters have deservedly gained notoriety for pushing this technology to extremes, the truth is that almost every big budget film project uses them liberally — and in far greater frequency than you’d imagine. This breakdown reel kindly shared by the Emmy-award winning effects team at Brainstorm offers a special peek behind the curtain of their work on season two of HBO’s hit Boardwalk Empire, highlighting just how much VFX work goes into vividly recreating prohibition-era America.