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Figure 3: Proof for superhydrophobic SG sponge walls. (a) Photograph of small water droplets dyed by phenolphthalein inside the SG (opened by cutting). (b) Photograph of a cross-sectional view on the inside of a SG with big water droplets dyed by phenolphthalein. (c) Photograph of full water column (dyed with phenolphthalein) filling the center of the SG. (d) Thermal image of SG (one end closed) filled completely with cold water (dyed with phenolphthalein). (e) Thermal image of a SG (one end closed) filled completely with warm water (dyed with phenolphthalein).