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This causes that they can only deform from 2D to 3D states. Here, a simple yet versatile strategy to decouple the monotonic correlation between the deformation rate and deformation degree of self\u2010shaping hydrogels is presented for achieving complex deformations from 2D to temporary 3D to 3D (2D\u2010to\u20104D). It is demonstrated that when the gradient hydrogels prepared by photopolymerization possess dense polymer networks, the local regions with a high deformation rate can exhibit a low deformation degree. The resulting hydrogels can thus deform in a novel 2D\u2010to\u20104D mode under external stimuli. During the deformation, they first transform into the temporary shapes induced by the local deformation rate difference, and then transform into the final shapes determined by the local deformation degree difference. Through controlling the ultraviolet irradiation direction and time to precisely program the local gradients of self\u2010shaping hydrogels, they can be designed to produce various unprecedented yet controllable 2D\u2010to\u20104D shape evolutions on demand, such as transformable origami, sequential gesture actions in finger\u2010guessing games, mobile octopuses, time switch, etc.<\/jats:p>","DOI":"10.1002\/smll.202104440","type":"journal-article","created":{"date-parts":[[2021,11,5]],"date-time":"2021-11-05T12:15:26Z","timestamp":1636114526000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":23,"title":["Precisely Defining Local Gradients of Stimuli\u2010Responsive Hydrogels for Complex 2D\u2010to\u20104D Shape Evolutions"],"prefix":"10.1002","volume":"18","author":[{"given":"Jincai","family":"Yin","sequence":"first","affiliation":[{"name":"College of Materials Science and Engineering State Key Laboratory of Bio\u2010Fibers 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