Science, technology, engineering, the arts and mathematics (STEAM) – it’s all harnessed in optics in some shape or form, and there’s no better place to explore this kaleidoscope of applications than at Silmo Paris… Just over 50 per cent of visitors to the Norde Villepinte this year came from overseas, with a total head count of 33,358 across the four days (26-29 September) – a 6.5 per cent increase on last year.