I know the key tenants of quantum mechanics, and am not interested in the measurement problem. What we do know is that a particle has a wave function that describes the likelihoods of it having certain EXACT values when we measure it. That's all good, but I am still confused how the classical world emerges from an underlying quantum framework. As I understand it, decoherence is different from "wave function collapse". For example, when I press my finger on my desk, are the desk atoms acting like they are being measured and taking exact values to repel my finger,? Or does my finger become part of the same quantum system and nothing has "collapsed"?