Concentration meditation sometimes has the vibe of an old tower defense arcade game: trying to detect possible distractions as early as possible so as to fortify attention, a feeling of being beset on all sides, noticing that enemy already past the gate, etc
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Funny how this vibe is only possible in so-so sessions. Has to be going well enough to notice subtle distractions before they threaten forgetting, but poorly enough that subtle distractions are still meaningful threats without continuous vigilance.