Legacy.

Williams/LAT

We much prefer to celebrate birthdays rather than remember deaths.  The ultimate legacy of Senna's death  was a new attitude towards safety, an attitude which finally refuted the lingering notion that driver safety was secondary.  

Formula One has done a lot homework but there is still so much to do elsewhere. This is especially true when it comes to circuit safety, the losses of Allan Simonsen and Sean Edwards come to mind.  
As a tribute on this day, we would encourage all who race or participate in the sport to join the Motorsport Safety Foundation, a forum for discussions about any possible improvements.  

I think Ayrton would have liked that.