There is clearly more to King’s Cross Station than meets the eye. Readers will no doubt be familiar with Platform 9 3/4, a feature of the Main Line station, visible only to the egregious boy wizard and his pals.
King’s Cross Underground station has, notwithstanding inasmuch as which, risen (or perhaps sunken) to the challenge posed by its Overground partner. Passengers on the Metropolitan Line platforms are required to exhibit wave/particle duality and behave like quanta in the famous two-slit experiment, gaining access to the platform by both entrances simultaneously.
Given that the diffraction experienced by passengers on the other side might occasion inconvenience, or even, dare I say it, embarrassment, staff are under standing orders to avert their gaze during the process. After all, one wouldn’t want one’s wave-function to collapse just as one was expecting to board a semi-fast to Uxbridge, would one?