Then I walked back along that row of mirrors, swinging the hammer and sending bright spikes of glass into the summer air.

NEWYORKER: Miracle Polish

Ehrsson created a scenario where the illusory body was threatened - by swinging a hammer towards the virtual figure.

CNN: Scientists recreate out-of-body experience

To make sure his volunteers were telling the truth, Dr Ehrsson surprised them after two minutes of tapping by swinging a hammer towards the camera.

ECONOMIST: Consciousness