Fig. 3. A fast self-folding box driven by light.

(A) Time profiles of self-folding movements of a cross-shaped piece of paper with and without NIR light irradiation. The sample was placed on the platform and illuminated with NIR light (100 mW cm⁻²) normal to its surface (light is incident from above). (B) IR images of the self-folding box with and without light illumination (100 mW cm⁻², NIR light).