<story><title>Accidental Pinhole and Pinspeck Cameras (2014)</title><url>http://people.csail.mit.edu/torralba/research/accidentalcameras/</url></story><parent_chain></parent_chain><comment><author>tgb</author><text>Relatedly, the fact that light is reversible (behaves the same forward in time&amp;#x2F;direction as backwards) means you can swap the light source and camera of an image (if just one point lightsource). I.e. you can render the scene from the perspective of the light source as if light were emitted by the camera. I recall seeing a neat demo of this but I can&amp;#x27;t find it on google. Anyone know it?</text></comment>
<story><title>Accidental Pinhole and Pinspeck Cameras (2014)</title><url>http://people.csail.mit.edu/torralba/research/accidentalcameras/</url></story><parent_chain></parent_chain><comment><author>ChuckNorris89</author><text>Your optical mouse sensor is also a low res camera. In older models you could dump the picture through a debug mode.&lt;p&gt;Also, LEDs can also act as light sensors. Food for thought.</text></comment>