The great experiments

[Plenum]

to answer your question more specifically, our Logos chose a more 'vivid' experience:

Ra: I am Ra. This creation is somewhat more condensed by its Logos than some other Logoi have chosen. Thus each experience of the Creator by the Creator in this system of distortions is, relatively speaking, more bright or, as we said, vivid.

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My take is that it is an experiment of unconditional love.

3D is about choosing a path.  And one of those paths is opening the heart.