Inspired by tweets from 🐦 @Chris_Said and 🐦 @gsarcone here's an SVG version of the Müller-Lyer ↕↕ illusion. None of the grey lines are changing length, they all remain the same size! Give me a shout at 🐦 @rowan_m with any comments, feel free to remix and modify with that little fish button over there 🎏↗️
[Science 🔬 version]