angled angles Australia climb climbing constructed construction curve curved curves danger dangerous deoxyribonucleic-acid DNA-double-helix-molecule DNA-Tower double double-helix handrails height helices helix helixes high Kings-Park lookout lookout-tower park Perth platform public- park skywards spiral spiral-staircases spiraling spiralling staircases steel strength strong structure top tower towering turning view viewing-decks Western-Australia background biochemistry biology biotechnology chemistry chromosome clone cloning deoxyribonucleic dna education gene genetics illustration lab life medical medicine microscopic molecular molecule organic pharmacy research ribonucleic science scientific stem strand symbol technologies technology test therapy acid adenine cell cytosine evolution guanine health human pharmaceutical thymine white blue dark