Barcelona's Champions League winning team from the 2008/09 season will forever go down as one of football's greatest ever sides.
Managed by Pep Guardiola and featuring Lionel Messi, Xavi and Carles Puyol, it was just about as complete a team could get.
Pace, power and creativity in abundance meant the Blaugrana dominated European football for years and introduced a new era of tika-taka football.
A lot has changed in those eight years, though, with Guardiola now at Manchester City trying to implement the same philosophies that made him so successful at the Camp Nou.
And it's working. City have looked unstoppable so far this season and are hot favourites to win the Premier League in Guardiola's second term in charge.
It's still a work in progress, but the Citizens are starting to resemble the Barcelona side that achieved the La Liga and Champions League double in 2009.
Guardiola has discovered a winning formula, which Thierry Henry analysed to absolute perfection on Sky Sports two years ago.
Back in 2015, Henry visually described to Jamie Carragher how Guardiola's system worked at Barcelona and it was fascinating to watch. Check it out below.
HENRY EXPLAINS GUARDIOLA'S TACTICS
Henry recalled how Guardiola introduced something called the 'Three Ps' at Barcelona, which were: play, position and possession.
He also revealed how the Spaniard once substituted him at half time for disobeying his orders and not staying out wide, despite scoring a goal because of it.
"How many times would we see a player come and ask for the ball [deep in central midfield]?" began Henry. "Not with Barcelona.
"Stay in your position, trust your team-mate on the ball, and wait for the ball. Look at where I am. That position allowed Iniesta to get the ball because I'm occupying the right-back.
"Freedom, [in the] last third, run, you're allowed to. You start in a high position, and wide, but after that, you can do whatever you want.
"Basically from training to the game, up until the last third, he (Guardiola) used to call it the 'Three Ps' - play, possession and position. And the most important one was position.
"You have to stay in your position, trust your team-mates and allow the ball to come to you. In training, to make you understand that, especially for Xavi and Iniesta, he would put cones [down].
"Up until the last third, guys who were playing on the right were not allowed to cross over to the left, and on the left you were not allowed to cross over to the right. But the last third was freedom for us.
"He used to say to us the fist time he took the team, 'my job is to take you up to the last third, your job is to finish it'."
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