This volume explores the cultural, religious, and ethical dimensions of extremism in an age marked by accelerated digital transformation and ideological polarization. Drawing on semiotic theory, cultural history, and contemporary media studies, the introduction frames extremism not as a fixed position but as a dynamic process shaped by shifting cultural, technological, and epistemic conditions. The authors argue that extremism emerges from oscillations between opposing tendencies—rationalism and mysticism, transcendence and immanence, inclusion and exclusion—reflecting a broader pendular logic in cultural evolution. They conceptualize these oscillations using physical analogies such as harmonic, damped, driven, and chaotic oscillation, highlighting how cultural change can be predictable, attenuated, accelerated, or fragmented. In particular, digital technologies have intensified the speed and frequency of these oscillations, often bypassing traditional institutions and reconfiguring religious authority, sacred space, and ideological cohesion. While the pendulum metaphor helps explain the energies behind cultural shifts, the authors warn that contemporary fragmentation undermines synchronization and coordination, fostering division rather than dialogue. Ultimately, the volume calls for new mechanisms of cultural and digital alignment—technologies and practices that can stabilize shared meaning without stifling pluralism. By examining extremism across disciplines and media, the book offers a rich framework for understanding the forces shaping belief and identity today.