Periscope and screen
You would also have to somehow translate the movement of your physical periscope to the keys that turn the periscope on the screen (i.e. turning your physical periscope to the right would be the same as pressing the right-arrow key etc). One suggestion; TrackIR-type setup (sensor part on top of your monitor and the reflectors on your periscope i.e. the periscope takes the place of your head so to speak).
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