Arsenal's Emirates Stadium home had become a toxic place to be in the last days of Arsene Wenger's 22-year reign. ............
In a few short weeks, Emery's positive approach and perpetual motion body language has made the clouds roll away. Emirates Stadium is transformed, no longer a theatre of pain, but somewhere that once again resembles a football stadium.
Emery is a coach of real pedigree with concrete belief in his methods. The Spaniard won the Europa League three times in succession with Sevilla, including one against Klopp's Liverpool in 2016, and is a formidable tactical mind.
And yet plenty of observers suggested Emery's style of pushing full-backs high and playing out from the back might see Arsenal fall into the trap Klopp's Liverpool set with expertise using their powerful front three of Sadio Mane, Mohamed Salah and Roberto Firmino.
It was a test of Emery and his players, of their resilience and self-belief - in many ways a test of what exactly he is trying to bring to Arsenal.
Emery fielded his big four attacking players Mesut Ozil, Alexandre Lacazette, Pierre-Emerick Aubameyang and Henrikh Mkhitaryan. He was bold and was rewarded.
Lucas Torreira was outstanding in midfield and Arsenal were fearless in their approach, confronting Liverpool eye-to-eye.
Yes, there was a wobble after James Milner put Liverpool ahead but there was no sign of the capitulation we may have witnessed in the past. Arsenal kept at it and got a point.
It was also further evidence that this Arsenal side, while retaining the flowing game that was their trademark, also has stomach for the fight.
Arsenal have won more points from losing positions, eight, than any other team in the Premier League this season and while they have not led at half-time in any of their league games, they have scored 19 goals after the break - more than any other side.
It is early days and there will be bumps in the road as Emery imposes his new philosophy on Arsenal but if this was earmarked as the most severe examination of their credentials so far this season, they can be quietly satisfied with the results.
UNAI EMERY'S RED ARMY! 
