The following pictures show geometric relation between two [flatly foldable] bird base diagrams in modification both given by Mr. J. Maekawa:
The left side diagram has appeared in the preceding article:
Fish base → Bird base → Fish base, while the right side one has been mentioned in the previous article:
Modifications: the bird base on a square.
Here are bird base diagrams containing the right side one above in successive variation, those are arranged in the same order with respect to corresponding diagrams in the
preceding article:

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