When mechanochromic photonic crystals are stretched or compressed, their nanoscale structure deforms, changing the spacing between layers and shifting the reflected light wavelength. This causes a visible color change, which is useful for visual strain se interestingasfuck
​A David vs. Goliath Moment. Not sure was type of spider this is, but it has its hand full with this Oriental Latrine Fly (Chrysomya megacephala) spiders
