I understand this, but it truly is possible to make such picture
With a camera, you play with a factor "aperture/time" for getting the right exposure.
Basicaly, lens aperture will bring you depth of field control and shutter speed will give you the possibility to freeze a movement, with a short shutter speed, or to unfreeze a movement (it's a choice) with a longer shutter speed (here 15sec). The movement could be the one of the subject but it can also be a movement the photographer will have, just as here. By moving the camera the highlights of the subject get painted on the darker parts creating this kind of surreal effect, it is called light painting