What appears to be a visual love letter to his soulmate, actually may have lead to the demise of their relationship. As you can see through the photos, her expressions seem to change overtime. His "loving gaze" kept her under constant scrutiny, always feeling like she was being observed. As you can imagine, there must be a weird amount of anxiety caused by constantly being watched and documented.
After ten years of being married, his wife, Yoko, decided to leave him stating "Through the ten years we lived together, he would only look at me through the lense of a camera. The photos he took of me were undoubtedly depictions of himself".
This drove Masahisa into a deep depression where he would find solace in photographing ravens. His obsession with ravens spanned 10 years, and his Ravens book is considered one of the most important photo books of all time.