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Tonglen is an advanced practice now taught to beginners by some . . . Yep, strange but true.
I like to do my own version on occasion, using a Russian doll image. These are the Russian wooden dolls nesting inside each other.
I am not interested in becoming a wooden Russian, so I visualise myself as a Buddha Bodhi. There are many tantric practices that invoke this initial phase.
When I have a 'perfect' centering Boddhisattva, I visualise the Buddha in my being expanding, with a new more perfect visualisation at the centre. The old 'dharma doll shell' falls away to bow before Buddhas, feed the Purelands and dharma hungry needy etc
Then I continue for a while with new Buddha Dolls.
The reason I mention this is because focus on breathing in negativity and transforming it can be detrimental to those not partially cleansed of impediments. They get caught in their own smoke and mirrors . . . tsk, tsk . . . who would have thought . . .
Another way I do this is with a 'metta bubble' that works as a transforming mirror based around the heart/mind. On the in breath the negativity/dukkha is drawn in and immediately begins to be transformed and add to the radiance of metta from the core inner Buddha quality of metta. The metta is for all beings in all realms.
Have you adapted or modified a traditional practice? Do share.