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 @5a4c912a @134318c2 

Bridges.

Gravity works the same way everywhere in the universe, and bridges are shaped the way they are because of gravity. This means that bridges on any planet will assume similar shapes. An alien civilisation may have different ideas of language, transport, food and society, but their suspension bridges will look a lot like ours. This will instantly get them on our side and help them realise common cause with us. 
 @fe642545 but they only need bridges, if they can't fly! @134318c2 
 @5a4c912a @134318c2 

This is true but they'll only fly to the shops. On the way back the bags will be heavy so they'll have to walk or drive. 
 @fe642545 only if they have shops. or bags. maybe they have flying horses and pouches like cangaroos and all what they need grows on a single tree in their backyard ;) @134318c2 
 @5a4c912a @134318c2 

I'm fascinated by the implications of everyone having a tree in their backyard which provides them with all they need. I want to read stories about the society which would come to pass. Would they understand the concept of community? What would happen if the tree were damaged? How would they handle population growth - planting more trees at the same rate?

This sounds like a metaphor that can be used to talk about post-scarcity and full-automated societies. 
 @fe642545 just look at hunter-gatherer societies ;) @134318c2