I have been posting a lot of 0.15.0 contents recently. Here is another one. In fact, I did made a post about the Observer Block being introduced in 0.15.0. While some of you can’t wait to mess around with it, others might not know what to do with it. Well, here is a brief introduction. This is Secret Observers, a tutorial map on the new observer and piston blocks.
All credit goes to AgentCPU0
The Observer Block detects any alterations in blocks facing its direction and sends out a redstone signal in such cases. I don’t really know much about it either, but the map itself is pretty much self-explanatory on its own. Secret Observers is a really nice map to get used to the Observer and Pistons.