A list is an odd creature, take 3

I mentioned to my first-year students that a list is an odd creature: it has only a head and a tail, where the tail is itself a creature with only a head and a tail, and so on. I challenged them to produce a picture, and Dan Benveniste came up with this:

I like the recursion, but it's not really a creature, is it? Further attempts encouraged! Previous entries:

How about something like this?
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