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BSA arguably enforces its self-declared membership ' standards ' only when not doing so would jeopardize the integrity of the exclusion policy . " There is only one chromophore ( one molecule ) that is responsible for a chemical reaction that takes place in the eye allowing humans to see , " Zand said , " that molecule is Retinal , a form of vitamin A. " Retinal combines with a protein called Opsin to form Rhodopsin , the chemical entity ( protein ) responsible for vision . There , jazzy pop star Gilberto Gil , now Brazil 's minister of culture , promised to " tropicalize digitalization " , presumably a reference to bridging the developed and developing worlds . Also includes a searchable Latin and Greek inscription database Herodotus on the Web " ... When it is moved around and / or oriented vertically the BBs form a " crystal " arrray with a hexagonal structure and lots of " faults , " as seen in the photograph .