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"Inside a bud, a flower’s petals lie in wait, a tight bundle of compressed tissue. When the conditions are right, they burst forth, blooming in an impressive display of geometry and color. During this opening period, which may last as long as 7 days or be as brief as 5 minutes, the cells that make up the petals may expand to 20 to 50 times their initial length. This great and relatively sudden inflation accounts for most of the flower’s shape. Some cells within the petal grow more than others and this differential growth is responsible for the 3D form of the petals. [...] Multi-material 3D printing may give us a way to incorporate such movements into the architecture of products and buildings. The provocatively named discipline of 4D-printing explores fabricating shape changing materials by means of 3D-printing. The differential growth of flowers suggests a way of designing such shape changing products."
