My former boss had a rule of “One novel thing per project”. This was both an upper and lower limit, which ensured that he was “always learning”. I’ve followed

My former boss had a rule of “One novel thing per project”. This was both an upper and lower limit, which ensured that he was “always learning”. I’ve followed that rule for decades and always regretted it when I couldn’t: projects were either too boring or too stressful except at the magic level of novelty.