Iibhloko zegeyiji (ekwaziwa ngokuba ziibhloko zegeyiji, iigeyiji zikaJohansson, iigeji zokutyibilika, okanye iibhloko zikaJo) yinkqubo yokuvelisa ubude obuchanekileyo.Ibhloko yegeyiji yomntu yintsimbi okanye ibhloko yeceramic ethe yachaneka yaza yadityaniswa kubukhulu obuthile.Iibhloko zegeyiji ziza ngokweseti zeebhloko ezinoluhlu lobude obuqhelekileyo.Ekusetyenzisweni, iibhloko zihlanganiswe ukwenza ubude obufunwayo (okanye ukuphakama).