Context:
Thinking about in some stories/shows where they deliver messages attached to arrows and wondering what a non-threatening method might look like.
Thinking about in some stories/shows where they deliver messages attached to arrows and wondering what a non-threatening method might look like.
Pneumatic Tubes come to mind.
Or a simple zipline with a motor/crank on side to retract the cart when going uphill.
edit: even simpler, a clothesline.