Colour!

well I wanted to add a bit of colour after the mono month so here is an example of the use of Photo-elasticity - all to do with how polorised light works.  I used the ipad as a source of polorised light and various bits of plastic items on it.  Then a polorising filter on my camera.  By turning the filter you get more or less colour!  I did this once before:here.  Help here!