Ů��С��Ƶ

Parisian wave-particle duality

FEEDBACK’s consideration of quantum instructions has, to date, focused on the spatial aspects – as with the UK Royal Mail’s request to “Please Use Both Letterboxes” in Salisbury (12 July) and London Underground’s exhortation to “use all doors” (16 June 2007).

France has – as one might expect – a different take on pedestrians’ abilities to exhibit wave-particle duality. Visiting Paris recently, we were startled to see the centre of the city liberally scattered with signs demanding “Piétons – Attention! Traversez en 2 temps”.

At first glance, we translated this as “Pedestrians – cross the street in two times”…