I see light moving!
Thanks JJ, truly fascinating
After watching the 2nd video (the one with the Tomato) I have a totally different appreciation and understanding of a simple shadow.
My normal perception was that a shadow was just the object blocking a contsant stream of light. Its as if the light is still travelling but the object is in the way (if you know what I mean). The light still travelling from the light source is being block hence creating a shadow.
But, watching the video, it shows a
single pulse of light which has already passed the tomato and hits the wall, has no following stream of light to create the shadow, yet there is a shadow of the tomato from that pulse of light!
Which has now implanted in my mind the process of the light be absorbed by the tomato (or any object in the light path) and when the rest of the light hits the wall the parts that hit and were absorbed by the tomato are missing.
So, a shadow is NOT cast (as thought by most), it is an absence of light.
It's like a cardboard cut-out!
) and relates well to that childhood belief that you could actually turn the light switch off and jump into bed before it got dark....now that woudl make a great sequence with this camera 
.
