Formula 1 will look very different when it emerges from its winter hibernation in 2017 - and not just because for the first time in 23 years the reigning world champion will not be racing.
Nico Rosberg's decision to retire after winning his first world title not only left Mercedes with an awkward hole to fill alongside Lewis Hamilton, it means the German will not get the chance to drive new cars that are aimed at reinvigorating the sport.
Teams are faced with a radically revamped set of rules that will lead to faster, more dramatic-looking machinery.
Cars will be wider, with big, fat tyres, and reshaped front and rear wings. In theory, drivers will be tested physically in a way they have not been for nearly a decade.
The idea is to inject a bit of edge and rawness that some feel F1 has lost in the past few years - and hopefully end three years of Mercedes domination.
So, will it work?
The plan with the new rules is to make cars up to five seconds a lap faster and test the drivers physically more than they have been since Pirelli tyres entered F1 in 2011.
A number of changes have been made:
The total width of the cars - the 'track' - has been increased from 1,800mm to 2,000mm, returning them to pre-1998 dimensions.
The bodywork has been widened from 1,400mm to 1,600mm - wider than ever before.
The area under the car with which teams can produce downforce has been significantly increased.
The front wing has been widened and will now be a delta-shape, while the rear wing has been made lower and wider.
Tyres are bigger - up from 245mm wide to 305mm at the front and from 325mm to 405mm at the rear.
The result could be dramatic. In October, governing body the FIA compiled information about the downforce gains made by all the teams. The average gain was 15%; the most was 131%.
And senior insiders say downforce gains could reach 40% by the end of the year.
The effect of this will be vastly increased cornering speeds, especially in high-speed bends. Engineers talk about 130mph corners becoming 150mph; some bends that were not flat-out on the throttle will be. Cornering forces will be going up - perhaps by as much as 1G in fast corners.