Minsky wrote the book "Perceptrons" (with Seymour Papert), attacking the work of Frank Rosenblatt, which became the foundational work in the analysis of artificial neural networks. This book is the center of a controversy in the history of AI, as some claim it to have had great importance in discouraging research of neural networks in the 1970s, and contributing to the so-called "AI winter". He also founded several other AI models. His book "A framework for representing knowledge" created a new paradigm in programming. While his "Perceptrons" is now more a historical than practical book, the theory of frames is in wide use. Minsky also wrote of the possibility that extraterrestrial life may think like humans, permitting communication.