The room will now obscured, but something bright will appear before us: the screen with the title of my presentation, which includes the word spirituality. This word was not included in the wonderful list of topics of the symposium that has originated this volume: the concept of time, infinity, nothingness, the function of numbers, the origin of thinking, the human brain, the relationships between artistic and scientific creativity. I think the concept of spirituality spans over all these themes. I will not specifically speak about spirituality, but its presence will perhaps be perceived from my work and it will thus be possible to understand what I mean.