Rails Engines are useful. We can make our code well structured and reusable using Engines.
Rails Engines are fun. You can publish your Engine repo to the world, then make yourself and the world better and happier.
Rails Engine is a sophisticated system. Even though 猿人 (en-jin) in Japanese means "ape-man".
Rails Engine is zen. Everything in our Rails app is an Engine, and Engine is everything. Even the Rails app itself should also be an Engine.
During my talk, you will get to know what exactly Rails::Engine is, and you will see some of my crazy Engine tips, ideas, and implementations around Rails::Engine.