For 15 years, Johannes has been taking interfaces apart and collecting the mechanisms underneath. There’s a name for when your cursor sits between bold and regular and the system can’t tell you which wins. It’s called cursor affinity. Your tools are full of mechanisms like this — each with an inventor, a constraint, and a lineage you can trace. This talk takes them apart, names them, and hands you a practice for disassembling any interface you touch. You’ll leave with the words to make others see what you see.