the fact that decorative features had come to include not only the spiral ramp , which stretched from ground level to the very summit of the building , 555 metres in the sky , but also the novel slanting terrace roof and viewing gallery , possibly had required a substantial exchange of casino chips in negotiations at some managerial level , but no amount of sordid speculation could take away the fact that the walkway , like the internal spirals of a nautilus shell , was a spectacular creation of wonder and beauty , which could have only been lessened by any concessions towards safety .