Outer Space

On the home planet, they had looked up at the stars and the heavens for millenia, wondering what it was and what was out there. Eventually their technology and political and social state had reached a pitch where they decided to undertake the great endeavour. The journey into outer space.
They had always suspected or known that they were not alone in their universe and they were being watched by other beings. They felt that if they could make contact with these other beings that it might help them evolve in new and perhaps unexpected ways.
To this end they established several colonies on suitable worlds, each with a different culture, to see which of their colonies might be contacted first.

On colony Alpha the mode of greeting was to walk up to someone, jump in the air and bump chests with a loud shout while staring unwaiveringly into your friends eyes then clap each other on the shoulder while laughing heartily. The friends, would then typically, stand shoulder-to-shoulder whilst admiring the view and with a positive statement to each other,(the favourite was "we have all the time we need"), part company and carry on their way. On this planet there was much sport, merry-making, singing, dancing and high spirits. Colonists who couldn't take the strain usually returned to the homeworld for rehabilitation.

On planet Tranquil, two friends would greet each other with a small nod of the head. The protocol was to keep the head lowered and not make eye contact. Conversation was kept to a minimum and best avoided. Any chance for the ancestors tendency to use social interaction as a test of dominance or position in the hierachal herd was kept to a minimum. Any colonist who in a burst of uncontainable indiscipline, let out a whoop, lifted their head to the sky and ran off to some high place with their arms flailing, there to jump up and down singing "I'm the king of the castle", ( and it was a common and well recognised psychosis), was sent back to the homeworld for rehabilitation.

On planet One Mind, the colonists spent as much time as possible plugged into The Game. The Game was a fully immersive computer game where the participants manipulated their avatar in the virtual terrain of the simulation. The idea was to entrain other avatars to yours so that they would follow behind in an ever widening phalanx. Any colonist who tired of The Game, (it was extremely boring and infinitely complex in it's detail), would leave his avatar trailing the one of his choice and retire to the homeworld.

Every few years, each of the colonies would send a representative to the furthest edge of the known galaxy to board a spacecraft fitted with every known type of communication device. The craft would then blast off in a great spiral, back through the known galaxies to the homeworld, listening for an answer.
Back on the homeworld the craft were much in demand as chic second homes and it's occupants were much in demand on the lecture circuit.