Abstract: Some small thoughts of a participator on 2025 Nobel prize on macroscopic quantum phenomena of a paradigm shift: the difficult thinking process on theoretical side and the courageous effort of experimentalists. Together they demonstrated the wider validity range quantum mechanics. It is also a good example showing the power of the small research group consisting of student, postdoc and professor, as well as of international collaborations in moving science ahead.

Key words: macroscopic quantum physics, open systems, Josephson junction, quantum tunneling, dissipation