If you happen to find the March issue of W Magazine, thumb through until you reach Stella McCartney’s most recent ad. You will be rewarded with a sultry Kate Moss, languidly dangling Jeff Koons’s signature chrome bunny from pursed lips. McCartney, known for her smart, playful, androgynous garments has recently coupled up with the infamous Koons (an investor-turned ready-made artist), represented by none else than Kate “Cocaine” Moss, the art world’s most adored model.

Scientists in Amsterdam have decoded the emotions behind her enigmatic expression.