Kasper Stoy has been active in the field of modular robotics for more than a decade and is increasingly tired of repeating scientific points already made years ago. The book "Self-Reconfigurable Robots: An Introduction" was written as a solution to this problem: a completely selfish act to reduce the amount of time I spend on explaining introductory stuff to students, young researchers, and my mom. Hopefully, it can help you too maybe even with the more advanced topics of self-reconfigurable robots.