A continuous  light such as a torch or candle can be mixed with flash light to create a composite negative with two exposures. How to get this effect: 1.  Set the camera to multiple exposure. 2.  Use the camera on a tripod with a cable release. 3.  Meter for the flash light (or overhead/daylight in the case of the Picasso or Dance Hall images) and make the 1st exposure. 4.  Then in a darkened space where the torch is the only light source use a long exposure to record the movement of the torch (this could be about 20 seconds for example). 5.  The torch Read more