Cuam tshuam lub hau ntawm cov hnab yas, xav tias tshwj xeeb ntawm cov khoom siv "Crystal."
Crystal-type openings vim ntau qhov chaw, muab faib ua "hnyav" thiab "kaj" ob pawg. Hnyav hnyav raug hais txog cov khoom siv hluav taws xob ntuj qhib. Lub teeb pom kev yog cov uas sib xyaw ua ke. Qhov txawv yog tias, hauv tib lub ntim, qhov hnyav ntawm qhov txawv txav. Los yog hauv qhov hnyav tib yam, muaj qhov sib txawv hauv qhov tag nrho ntawm cov khoom zoo ntawm tus neeg sawv cev qhib. Lub teeb qhib tus neeg sawv cev, thaum muaj qhov hnyav, vim hais tias tus neeg qhib cov khoom seem qhib qhov hnyav ntawm tus neeg qhib hnyav heev ntau dua qhov hnyav qhib rau nws. Yog li, cov nyiaj yuav raug txo, yog li ntawd tag nrho kev xa xov ntawm kev sib txuas ncaj ncaj zoo tuaj, cov transparency ntawm hnab yas tau ntxiv lawm.
