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Polymer microbristles embedded in an 'artificial muscle' made of hydrogel form strikingly different patterns with changes in humidity.

Polymer microbristles form an array of 'X'-shaped microtraps that change shape as the humidity level changes.

Polymer microbristles, embedded in an 'artificial muscle' made of hydrogel, form strikingly different patterns when the humidity level changes.

Engineering self-adaptive modular robots: A bioinspired approach