 Many MIT students also engage in " hacking " , which encompasses both the physical exploration of areas that are generally off @-@ limits ( such as rooftops and steam tunnels ) , as well as elaborate practical jokes . Recent high @-@ profile hacks have included the abduction of Caltech 's cannon , reconstructing a Wright Flyer atop the Great Dome , and adorning the John Harvard statue with the Master Chief 's Mjölnir Helmet . 
