“…28 The soft robots/machines discussed above were inspired by invertebrate animals (e.g., squid, starfish, worms), 26 and their further development mimicked the color-changing abilities of animals such as cephalopods, which can change their color, contrast, pattern, apparent shape, luminescence, and surface temperature for camouflage and display (Figure 1c). 29 Finally, two recent microfluidic devices were used as tissue surrogates (phantoms) for calibration and validation of imaging methods, one standing in for human tissue in diffusion-tensor magnetic resonance imaging (MRI) measurements 30 and the other for superficial vascular networks in biophotonic techniques such as laser speckle imaging or Doppler optical coherence tomography. 31 Novel Physical Science.…”