Robin2:
Have you considered using the PC to get all the data from the internet and sending it to the Arduinos - which could then do stuff with the data and send other data back?
This is reversing the role of the boards in the concept. The boards should act on their own because they should symbolize electronic parts interacting with the surrounding on their own, while the PC is just for the user to add to whatever data is coming from the boards then generate the visual end.
I actually wanted to do everything without even a PC, but I decided to use the PC for the user input just to ease the process of making and make it more approachable for audience.