There is a phenomenon at Wimbledon that we might call Federer Face: that collective glow spread across the chops of spectators as they leave the show courts having finally seen the 17-time Grand Slam champion in the smooth-moving flesh.
It's a tiny claim on his greatness, the pleasure in being somehow part of his sporting story; a tale to tell the grandkids, the sharing in a communal homage to probably the greatest there has ever been.
With all Federer has done at Wimbledon, and the style with which he has done it, you can understand the reaction.