Thanks

https://en.wikipedia.org/wiki/Holography

Something to do with generating an interference pattern of the wavefronts but nothing that explains it where I’d understand.

Thanks for the info. Really disappointing, but not surprising, that Canada would spend the time and effort to establish the declaration but not promote it through their travel advisory information. The tightrope that is foreign relations is a real problem.

Edit: The link you provided didn’t work for me.