Phones are the natural enemy of the bull session. If someone checks a notification, the "flow" is broken.
Here is a blog post exploring how to bring the magic of the bull session into your modern life. bull session
If things are slow, throw out a "useless ignorance" topic—something you know nothing about but have a theory on. Phones are the natural enemy of the bull session
You don't come with a PowerPoint; you come with a curiosity. bull session
These sessions are "long-form" by nature—they allow for the "grand theorizing" that quick texts can't capture. Why Your Brain Craves One