But if you can imagine a dark lake where ash and smoke mingle, and where bits of molten rock, black and red, bubble and gurgle, where imperceptible simmers of quitely brushed drums and tinkling piano notes have the savage beat of a disgruntled bass plodding beneath them; if you can imagine stasis and motion fused together so that stillness moves to chaos without you noticing that either of them started or finished; if you can imagine music tremoring beneath you, weaving around you, seducing you and smothering you with its single 40 minute arc of darkness, at first hypnotically fine and sensual and then, before you realise what has happened, impenetrably dense: if you can imagine all of that, then you might have a sense of what The Necks created when they opened proceedings at Melbourne's Forum Theatre last night.