Well. He's old enough to know what those rockets are. Also: That thing was full of rockets on the first day he shared the address and I totally knew it was gonna happen ;)
I'm more afraid of worse things strangers would be able to post directly to his wall.
At least it was a fun father-son-project.
I wrote the server part, he the client part.
First there is the web frontend (sending click requests to a script that saves the clicked pixel in a database, heartbeating to a script to refresh the "image")
You can emulate the rgb output:
Then there is the 64x64 RGB matrix and a raspy connected to it. It is quite hollow on it's back, giving the raspy some place to hide:
The code on the raspy connects to the server and refreshes it's image, if a change happened.
I also "hid" the matrix inside a canvas frame, to help diffusing the single RGBs a bit: