Ferrari's trial of the halo head-protection concept in Formula 1 pre-season testing last week reignited the debate over safety in motorsport's highest echelon.
As the FIA continues to investigate how to improve driver protection, an issue that gained greater weight in 2015 with the deaths of Jules Bianchi and Justin Wilson, the possibility of the halo (or equivalent) becoming mandatory in F1 looks more likely than ever.
It would be one of F1's most contentious rule changes. And it's not just among fans that opinion is divided - the debate takes place within Autosport as well.