they are multicoloured so different coloured and maybe that could mean the polymeres are different types.
In photography studies the main source for creating and Working with light and light to change mood or other dynamics such as artificial light exercise light painting ect other fundamental ideas are used to manipulate lighting in an image....
Common change is around all environments, from pretators, prey, food supply, and many more simple things. But change realy never happens unless its is forced. Natural selection
Voice A I think is good hope this helped