1. During indicates within a period of time.
We slept during the day.
They practiced basketball during the summer.
2. During means at the same time as another event.
I slept during the football game.
They lived in the north during the war.
Amazing Staircases Around the World
Musical piano stairs at Wulin Plaza Zhejiang Province
Chinas piano style stairs built at Wulin Plaza in Hangzhou make the appropriate musical notes when stood on. The 54 steps were installed to encourage people to walk instead of lazily take the escalator. The only problem could be too much noise if everyone starts taking the stairs.