The previous post began an exploration of a key conundrum in quantum physics, **the question of measurement** and the deeper mystery of the divide between **quantum** and **classical** mechanics. This post continues the journey, so if you missed that post, you should go read it now.

Last time, I introduced the notion that “measurement” of a quantum system causes “wavefunction collapse”. In this post I’ll dig more deeply into what that is and why it’s perceived as so disturbing to the theory.

*Caveat lector*: This post contains a tiny bit of simple geometry.