But what about those of us with an angry resting face? Via dezeen.

Ever judged a book by its cover? Amsterdam creative studio Moore has reversed the well-known idiom – designing a sleeve that scans your face and won’t open unless approached without prejudice (+ movie).

The Cover That Judges You has an integrated camera and facial-recognition technology that scans the face of whoever approaches.

If the awaiting reader shows too much emotion – either overexcitement or under-enthusiasm – the book will remain locked.

Only when pulling a neutral expression will the scanner allow an Arduino micro-controller to unbolt the lock and let the user browse inside.”Our aim was to create a book cover that is human and approachable-hi-tech,” Thijs Biersteker of Moore told Dezeen. “If you approach the book, the face-recognition system picks up your face and starts scanning it for signs of ‘judgement’.”

Moore designed The Cover That Judges You as a prototype for the Art Directors Club Netherlands’ 2015 annual, which is filled with an edited selection of creative work.

The camera is positioned at the top of the cover, above a screen that feeds back the image when it detects a face in close proximity.

Abstracted facial features that form the shape of the screen allow the prospective user to line up their eyes, nose and mouth in the optimum position.

Once the correct alignment is obtained, the screen turns green and a signal is sent to the Arduino board that opens the chunky metal lock.

“We often worry about scepticism and judgement getting in the way of amazement,” said Biersteker. “Judgement should never hinder relentless enthusiasm of seeing things for the first time.”

See more photos of the book here.