What an amusingly appropriate counterpoint ( no pun intended ) to the Spike !!!
I know of two examples. One's in Brighton ( tiny and unimpressive ) and the other I saw recently on a visit to Rome in the Gardens of the Borgia palace ( looked lovely lit up by internal lights in the fading evening light ). Also seen in Genoa was Renzo Piano's cable lift in the docklands, much more impressive and great fun.
Given the Gravity Bar and the Chimney do we really need another high vantage point from which to gaze upon the city and in particular Temple bar(f)?