Sonobe puzzler 3: Mirror images?

This is the last of three puzzlers for the Sonobe lover. The first two are here and here; for partial background, see my earlier posts [1, 2, 3, gallery] on the Sonobe unit.

I started building two icosahedra.  Here are the first five units:Here are the next five units:Then I continued adding units to each, following the same pattern but mirror-imaged. Here’s the result:

They don’t look like mirror images.  Why not?

(No hints for this one, I’m afraid.)

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