A soccer field has two equal sized grounds with two symmetrical goal posts in the center of the border line of the ground. The players have two eyes and two legs and hands, the ball is round and the two teams have an equal amount of players.
This of course does not apply to canchas. There it is the other way around. The game is not symmetric, different amounts of people play with oval and strange shaped balls. And sometimes the goal post itself is upside down.