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Such experiments have been done before. Not in Egypt, as far as I know, but it was shown through demonstration that the Nazcans, who drew the famous shapes in the Peruvian desert you can only see clearly from above, had all of the materials to build a functional hot air balloon.

The problem is that there's absolutely no evidence they ever did such a thing.

https://www.hallofmaat.com/americas/grounding-the-nasca-balloon/

Also, if you're making a picture for a god, it doesn't really matter if you can't see it.