Atmosphere is a very personal sporting adventure at test rugby.
For some it is a boiling backdrop of noise adorned with music and ground announcements stoked with lashings of food and liquid while they flit between the action, observations and the charms of the giant replay screens.
Others prefer the gentler thrum of anticipation, using a mix of binoculars and their eyesight to gauge the balance of the game and questioning observations with their mates during the frequent lulls in the game.
Watching test rugby at the stadium in Cardiff delivers all the elements with most occasions sending the dial towards the high end of the gusto-meter. The singing, the teams walking onto the ground, the national anthems -- with every phase the uproar goes up a notch.
When the roof is closed that wall of sound boomerangs around the stadium and engulfs everyone who has manoeuvred their way into the sports citadel in the city centre.