Hi,
I think a lot of it comes down to consider what the animal involved considers enrichment. There are a lot of different interpretations of what it involves and how the animal regards it.
On the most simplistic level we see a tub with a paper substrate - but to a python that is a hide that they can move around under to any of the available temperature zones without leaving the feeling of security provided by a dark low hide.
But this varies animal by animal - some love to climb when the opportunity is provided ( most of them fall off when they get larger ) but this needn't cause injury or stress if you plan it well.
It's one of those areas where you offer the animal the choices you think it might like and discard those it does not choose to interact with. We cannot ( whatever we hope ) replicate the open African savanah in an enclosed space so we try things to see if they are acceptable to the snake in question.
dr del
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