This is one of the designs in Origami Design Secrets, in a chapter on pattern grafting.  The hexagonal pattern on the turtle’s pack is folded first, then you fold the rest of the turtle around it.  You can also fold the turtle without the hexagonal pattern.

It’s a different style from the other turtle I’ve shared.

I spent an inordinately long time designing this model in 2024, so let me talk about it.

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I folded this from someone else’s origami book, which was in Japanese.  I don’t know why it’s called U4-30, although I know the “30” comes from the 30 sheets of paper it’s made from.  Perhaps this is the sort of technical name you come up with when you’ve designed lots and lots of variants.  Yes, it was an entire book of roses and floral balls (Origami Rose & Kusudama).  It’s very nice, so I think it deserves an entire book of variants.

It’s a curler unit, meaning the units are attached by twisting them together.  I used three slightly different shades of red, which gives it a subtle texture without creating contrast between the different units.

This is a tessellation by David Huffman, which I took directly from an academic article titled “Reconstructing David Huffman’s Origami Tessellations“.  It’s a great starting point if you want to fold 3-dimensional tessellations, or at least it would be if anyone made tutorials for it.  I’m shocked that this tessellation isn’t more widely known.

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I’m out travelling, but I brought some origami paper to fold.  I got this model from the 5th Geometric Origami Convention, and folded it on the train.  It’s essentially a variant of the herringbone tessellation, but slightly shifted so that it makes a shape like a sea urchin.