On Saturday evening, cricket was forced to ask itself exactly where it was heading when more than 80,000 spectators turned up in Melbourne to watch a game of domestic Twenty20.
It was a phenomenal moment for the sport, yet it posed awkward questions for the dear old Test, supposedly left to waste away with pipe and slippers. In Cape Town on Sunday, Ben Stokes came up with an instant retort.
His brutal 258 off 198 balls did many things. It broke records, destroyed bowlers' esteem and summed up the credo of this England side, which is to err on the side of incaution. But it also reminded fans that box-office batting needn't be the preserve of the 20-over format. And when it happens in a Test, it feels so much more significant.
The partnership between Stokes and Jonny Bairstow, whose unbeaten 150 would have hogged the headlines on any other day, amounted to 399 runs at a rate of 6.91 per over. That's almost three Twenty20 innings' worth of entertainment right there. Stokes, of course, is not the first batsman to take the Twenty20 mindset into the five-day format and make the bowlers wish the ground would swallow them up. Of the six fastest double hundreds in Tests, five have come since the introduction of Twenty20 in 2003.
When people talk about the death of Test cricket, they might just as easily be talking about the spread of Twenty20. Yet even by the standards of fast-forward Test batting, this was something else. Last year alone, English cricket witnessed the best of two very different types of Test innings. There was an 85-ball century from Stokes against New Zealand at Lord's, and a 14-hour 263 from Alastair Cook in Abu Dhabi (left).