Optical illusion of women on couch leaves people baffled as 'legs don't add up'

An optical illusion showing six woman sitting on a sofa but with only five pairs of legs on show has sparked a debate online after bewildering viewers.

In the picture, five woman are sitting on a couch in an unknown bar, with another woman perched on the wooden arm of the settee.

However, it seems there is a pair of legs missing - as only five can be seen between the six girls.