Mind-generated objects, such as visualizations, that in a well-developed visual-based first jhana are relatively stable, may now begin to move (spin, pulse, resonate, shimmer, subtly flux, or something similar) in the second jhana in ways that correlate with the phase of the breath, moving slowly towards the top and bottom of the breath and more quickly in the middle. This fine movement may be subtle to some and very obvious to others. Mantras may suddenly seem to be repeating themselves. The breath suddenly is noticeably breathing itself and there is something that feels great about that.
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