Hidden switch
Behind the picture is a pressure plate that you can throw an item at to trigger it.
Signal rockets at night/storm
This circuit shoots rockets at regular intervals at night or during rain/thunderstorms.
Sewerage system
If you have built a village of several houses, you can build a sewer system under the paths (picture shows cross section). Professionals can build them so that items are actually washed away and each house has a connection.
Small artificial aquarium
The aquarium can be used well for decoration. However, you have to be careful that the ice blocks do not melt.
Also, unfortunately, there are no fish.
Also, unfortunately, there are no fish.
