Mea Hoʻonaninani ʻOiai i ka kenekulia 21, ʻo ka hoʻohana ʻana i nā ʻenehana kiʻekiʻe hou o ka wā, o nā mea hou a i ʻole nā mea hou paha e pono ai e hana i nā hana hou, e hōʻike ana ʻo Gravity i kahi kū'ē. ʻO Gravity kahi hui o nā mea hoʻonanea kūpono e hoʻohana wale ana i ke kaula, kahi hana kahiko loa, a me ka gravity, kahi kumuwaiwai hiki ʻole. Hoʻohui ʻia ka hōʻiliʻili o nā helu kālā a he nui nā mea kālā, me nā hoʻolālā ʻē aʻe. Hiki ke pili iā kēlā me kēia hui me nā penina a i ʻole nā pōhaku a me nā pendants. Ka inoa o ka hōʻiliʻili no kahi nane o nā makana ʻokoʻa.