▁Other ▁Mississ ipp ian ▁cent ers ▁also ▁trad ed ▁in ▁these ▁pri zed ▁resources , ▁but ▁S pi ro ▁was ▁apparently ▁the ▁only ▁one ▁that ▁acquired ▁obs id ian ▁from ▁Mexico . ▁ ▁Using ▁these ▁val ued ▁materials , ▁Mississ ipp ian ▁artists ▁created ▁ex quis ite ▁works ▁of ▁art ▁reflect ing ▁their ▁cultural ▁identity ▁and ▁their ▁complex ▁spiritual ▁belief s . ▁ ▁When ▁commercial ▁exc av ators ▁d ug ▁into ▁Craig ▁M ound ▁in ▁the ▁ 1 9 3 0 s , ▁they ▁found ▁many ▁beautiful ly ▁craft ed ▁rit ual ▁artifact s , ▁including ▁stone ▁eff ig y ▁pip es , ▁pol ished ▁stone ▁m aces , ▁fin ely ▁made ▁fl int ▁kn ives ▁and ▁arrow points , ▁pol ished ▁ch un key ▁stones , ▁co pper ▁eff ig y ▁axes , ▁Mississ ipp ian ▁co pper ▁pl ates ▁( S pi ro ▁pl ates ), ▁m ica ▁eff ig y ▁cut ▁out s , ▁elabor ately ▁eng ra ved ▁con ch ▁shell ▁orn aments , ▁p ear l ▁be ad ▁neck laces , ▁stone ▁ear sp ools , ▁wood ▁car v ings ▁in la id ▁with ▁shell , ▁and ▁spe cially ▁made ▁mort u ary ▁pot tery . ▁The ▁con ch ▁shell s ▁were ▁fashion ed ▁into ▁g or gets ▁and ▁drink ing ▁cu ps ▁eng ra ved ▁with ▁intr icate ▁designs ▁representing ▁cost umed ▁men , ▁real ▁and ▁myth ical ▁animals , ▁and ▁geometric ▁mot ifs , ▁all ▁of ▁which ▁had ▁prof ound ▁symbol ic ▁significance . ▁S pi