Build bridges

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Two people. Each standing on the opposite side of a wide river.
They can almost make each other out from such a distance.
Both have figured that it is another person on the other side of the river but can't quite see them fully.
They try to communicate.
Yelling? Ineffective as no matter how much one yells the other cannot hear
Signals? You have to understand the meaning behind the signal to understand what the other is saying.
Each thinks, what to do? what to do?
Eventually one of them starts building something on their bank. The other one watches curiously. 
That person continues to build while the other watches. 
A little while later, the one watching figures it out and starts building on their bank.
They both continue to build until eventually they meet in the middle. They chat, get to know one another and eventually embrace before they part ways.
A while later, two other people on the opposite sides of a wide river notice each other and notice that they can now simply walk over to each other and get to know one another

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