Book excerpt: What makes a kaiju a kaiju? What makes an ape a large ape, and why do we sympathize with some, such as King Kong, and not with others, such as Konga? And what makes a giant person become a "monster"? This book provides a new perspective on kaiju and reveals that our boundaries for the genre are perhaps not so solid. The work focus primarily on newer kaiju works, ranging from Colossal to Shin Godzilla to Godzilla vs. Kong, but also touches on classics such as King Kong, Mighty Joe Young, Godzilla Raids Again, and lesser-known works such as What to Do With the Dead Kaiju? and Agon. Like our ancestors we have collectively adopted giant monsters into our culture, especially our pop culture. Within the domains where giant monsters walk, we experience the rigidity of our moral structures, and the fleeting borders of our definitions of humanity. Within the kaiju film genre rest our own assumptions about what makes a monster a monster, and, more importantly, what makes a human a human.