This is a great analogy, but also in experiments the presence or absence of the measuring device like a beamsplitter determines the outcome. The measuring devic

This is a great analogy, but also in experiments the presence or absence of the measuring device like a beamsplitter determines the outcome. The measuring device, the which-way detector is the observer, and it can be regarded as a quantum mechanical system. It's correlations with the rest of the system causes the particle behavior.