The Existential Musings of an Angst-Filled Cat. This book is a collection of photos and quotes from Henri, the existential cat whose ennui has captivated people all over the world. Henri’s contemplation and disillusion with the world has struck a chord with millions of fans. Now, finally, we have a collection of Henri’s musings in his own words featuring never-before-seen photos and quotes. This book is a window into the tortured soul of the world’s first feline philosopher.