Truffaut's cameo in his film gem

I admit it: I am a sucker for FILM DIRECTOR CAMEOS.
I love it when I can spot Terrence Malick as the man at the rich man's door in "Badlands," M. Night Shyamalan as the guard at the desk in "The Village" and of course, the 37 times Alfred Hitchcock appears in his own films.
This morning, I watched old favorite "LES QUATRE CENTS COUPS (THE 400 BLOWS)" and caught the blink-and-you-miss-it cameo by director FRANÇOIS TRUFFAUT.
Truffaut appears in the fun fair scene, riding on the centrifuge with protagonist Antoine Doinel (pictured).
It's a tough cameo to spot, which makes it all the more enjoyable.
There is so much to adore in this film, a classic of LA NOUVELLE VAGUE.