This approach paid rich dividends, as the band's playing was close to immaculate, with many genuinely breath-taking moments - particularly the big drops and drums, eerie harmonies and hip hop scratches of tracks like Cowboys, Glory Box and Machine Gun.
Those moments were enhanced by the syncing of the absolutely massive - and equally impressive - LED screen behind the band, which took up the entire width and height of the stage.
The visuals segued from underwater shots of seaweed to oscillating whirlpools; from an incredible bright orange-red rising sun to crackling, scratchy, grainy and extremely (mis-) treated live footage - often layered atop one another.
The lighting too was spectacular, with one particular standout moment the stark, bright red backlighting during a crackling hot reading of Glory Box.
At several points mobile phones were held aloft in the audience in a manner not unlike lighters at a rock gig, and there were moments when crunching guitars, the power of two drummers and layers of keys created an epic, stadium-like feel despite the confines of a truncated Vector.
A friend remarked, "They're so much better live!" and that summed it up nicely: the show was everything you would expect from Portishead if you'd only heard their albums - moody, eerie beats and a cinematic, widescreen sound - with that extra bit of polish which goes a long way to explaining their continuing appeal, despite their famed "relaxed" album release schedule.
A master-class in tension and release, both musically and visually, and a hugely impressive - and appreciated - return.
What: Portishead, The Adults
Where: Vector Arena, Auckland
When: Thursday, November 10
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- Volume