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IAAP so I’ll have a go at this.

The idea of requiring a ‘conscious observer’ is nonsense. It is the act of observing a quantum system that causes its state (its wavefunction) to "collapse" into one of a number of possible states.

Take the following Gedankenexperiment: imagine that you are a blind man and you are standing [...]

Experimentation. See the James Randi Educational Foundation.
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P.S. Before any of my fellow physicists tell me that I’ve confused the observer effect with the uncertainty principle, I’m aware of this but in this context the distinction is not particularly important.
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