A mash-up is a theatre-style larp where a mix of historical and fictional characters and tropes from a broad historical era are improbably combined in one place as a deliberate design decision. For example, The Great Exhibition is set in 1851, but combines characters such as William Gladstone, Benjamin Disraeli, Robert E Lee, Sherlock Holmes, Nikola Tesla and Thomas Edison, spanning a period from 1850 - 1900. Flight of the Hindenburg combines historical and pulp characters aboard the zeppelin sometime after the "War of the Worlds" broadcast (1938) but before the election of Roosevelt to the US Presidency (1933). The technique can also be used with fictional genres (e.g. Shakespeare or Jane Austen).