Kasinas and Four Foundations of Mindfulness

Mindfulness of Breathing is part of the Four Foundations of Mindfulness. Someone who practices Mindfulness of Breathing is also practicing Mindfulness of the Body. What about Kasinas? How does one practice Kasinas and the Four Foundations of Mindfulness at the same time?

If someone is focusing on a mental image of a kasina, does it fall under the fourth foundation (Dhammanupassana)? Does it count as mindfulness of Dhammas?

Satipatthana only takes realities as objects, it is very different from samatha bhavana. Thus while taking the mental image there is no satipatthana.
However, the one who masters jhana after leaving jhana can take the mental factors- realities - as object.

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