Flipping rectangle grid (or flipping tiles) with animation nodes Dear Blender and Animation Nodes Users

I'd like to create a flipping rectangle grid animation with a controller object. I need a tutorial on this, but I am not able to find any, which I deem good or up to date.

A similar effect, and tutorial can be found here: https://www.youtube.com/watch?v=0qYNoXmbHZo

but this one uses python code inside AN, I think Animation Nodes knows the necessary things without writing any code.

Thank you in advance, Michael
You can start by inspecting "Transform Individual Polygons" template. THEN, if you are using AN version 1.6, you have this handy pivot thing:

http://animation-nodes-manual.readthedocs.io/en/latest/release_notes/v1_6.html

There is actually an example over there that allows you to flip polygon face. 

A little bit of observation and experimentation and you will have the flip setup.