Showing up to lectures early comes with perks beyond just getting good seats. Most mornings on my way in to one of the lecture halls, I walk past one particular poster (the thumbnail of this post) which captures the beautiful shifting image of particle collision. Until recently, I'd never really thought about how or why that happened, or that process even had a name: lenticular printing. Inevitably, it had to become one of my posts, and true to form, here's my attempt at explaining it without it (hopefully) sounding like a boring Physics textbook.