I need advice on this

Hello guys,

I have an idea of making interactive flowers with the light. I am more designer than electric engineer so I need your help in building it.
A friend told that photodiode could be used to give electric impulses from the light. But I have no clue about the rest. Any reading, part, tutorial information regarding it would be much appreciated.
Meanwhile I am posting my explanation of where I am heading to:
In video from 00:21

and some of my drawings:

You need a source to provide current through the photodiode.

but how to make the leafs blend?

I don't understand your question.

The video is showing shape memory, alloy also known as "muscle wire" or "Flexinol". When you run current through the wire it causes the wire to heat up and retract.