I think that depends on the "embodiment" of the AGI; that is, what it's like to be that AGI and how its normal world appears. A bat (if it were a person) would probably prefer different metaphors than a human would. Humans are very visual, which makes spatial features very salient to us. Metaphors work because they leverage already-salient aspects of experience to illuminate other things. So to train an AGI, I would think it's more useful for that AGI to leverage the salient aspects that are pre-given.
I think that depends on the "embodiment" of the AGI; that is, what it's like to be that AGI and how its normal world appears. A bat (if it were a person) would probably prefer different metaphors than a human would. Humans are very visual, which makes spatial features very salient to us. Metaphors work because they leverage already-salient aspects of experience to illuminate other things. So to train an AGI, I would think it's more useful for that AGI to leverage the salient aspects that are pre-given.