In 2015, on the occasion of the fiftieth anniversary of the publication of scientist Lotfi A. Zadeh's article "Fuzzy Sets", which gave birth to fuzzy subset theory, and within the framework of the Week of Science held at the CosmoCaixa Barcelona Science Museumn, CosmoCaixa organized and exhibition in collaboration with various universities and Catalan institutions to present the results of research in the field of fuzzy logic during its firts century of life. This book is a catalogue of the objets on display and activities carried out at the exhibition.