Picking a perfect XI is one of the great joys of following world football.
It can be as simple or as complicated as you want to make it.
Pick your 11 favourite players and shoe-horn them into some sort of vaguely workable formation.
Or work out intricately which second, third or fourth choice would best complement a team based around those two or three must-have names.
You can limit yourself to specific clubs, leagues or countries, or better yet, themes like "Bad Hair XI," or you can open up your choices to the all-time best of the sport.
It's an art, a science, a fantastically efficient time-waster and a great way to stir up debate.
I couldn't possibly narrow down the wide world of football into one dream team, so here are four different takes on the concept.