Saype’s grassy graffiti: meet the street-art sensation who sprays mountains
The French artist’s giant biodegradable artworks adorn fields, are best seen by drones and last only days. Now, Guardian readers can get their hands on them
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The science of shopping: digital innovations shaping the future of retail
Stroll the boutiques of Milan without leaving home, lay a bet by voice, try on a dozen frocks without taking your coat off… Technology will soon make all these possible