▁man ▁and ▁nature . ▁Gr iss om ▁keeps ▁a ▁variety ▁of ▁spec im ens ▁in ▁his ▁office , ▁including ▁a ▁radi ated ▁f etal ▁p ig , ▁a ▁tar ant ula , ▁and ▁a ▁two - head ed ▁sc orp ion . ▁He ▁also ▁has ▁a ▁bullet in ▁board ▁that ▁looks ▁like ▁a ▁fish ▁on ▁which ▁un sol ved ▁cases ▁go : ▁" the ▁ones ▁that ▁got ▁away ." ▁Occ asion ally , ▁he ▁keeps ▁evidence ▁from ▁closed ▁cases ▁( such ▁as ▁the ▁models ▁created ▁by ▁" The ▁M ini ature ▁K iller "). ▁In ▁season ▁seven , ▁C SI ▁new com er ▁Michael ▁Ke pp ler ▁takes ▁a ▁look ▁around ▁Gr iss om ' s ▁office ▁and ▁obser ves ▁that ▁he ▁must ▁be ▁quite ▁a ▁fre ak . ▁In ▁" The ▁Gra ve ▁Sh ift ," ▁even ▁after ▁his ▁office ▁has ▁been ▁cleared ▁out ▁( and ▁later ▁rec laimed ▁by ▁a ▁somewhat - rel uct ant ▁Nick ▁Sto kes ▁after ▁Catherine ▁Will ows ▁passed ▁on ▁the ▁offer ), ▁the ▁f etal ▁p ig ▁in ▁a ▁jar ▁was ▁placed ▁back ▁in ▁there ▁by ▁H od ges , ▁who ▁stated ▁simply ▁that ▁"[ it ] ▁belongs ▁here ." ▁ ▁When ▁asked ▁why ▁he ▁is ▁a ▁C SI , ▁he ▁respond s , ▁" B ecause ▁the ▁dead ▁can ' t ▁speak ▁for ▁themselves ." ▁This ▁is ▁one ▁of ▁his ▁favorite ▁expressions . ▁ ▁Par allel ism ▁with ▁Sher lock ▁Hol mes ▁ ▁Gil ▁Gr iss om ▁has ▁a ▁more ▁than ▁passing ▁similarity ▁to ▁Sher