Put away the gallery guides – art is best when shrouded in mystery

A new app, Smartify, allows you to point your phone at artworks and instantly know everything about them. But while facts can enrich enjoyment, it is the shock of the unknown that really makes art resonate

From sweaters to suits: the evolution of Silicon Valley CEO style

Snapchat’s Evan Spiegel wore a sharp suit for his company’s IPO – a far cry from the relaxed look we’ve come to expect from tech entrepreneurs

Fur flies as Stella McCartney unveils ‘skin-free skin’ in Paris

Designer and agitator for animal welfare showcases cruelty-free fashion, while Alexander McQueen’s show is full of sensual suggestion

What drives the demand for rhino horns?

Should we accept that Vietnamese medicinal demand for rhino horns is traditional, and inevitable? Those who stockpile horns think so