Amateur video filmed in Nanjing in the Ming Dynasty shipyard. I have seen Zheng He's ship compared to Columbus' flagship in diagrams; this is the first time I have seen the contrast portrayed with models.
Addendum: I think reader BJN is correct in pointing out that the scales of the two models in the video are not in exact concordance; the idea is correct, but the math is wrong. Here is a photo of models from another source that may be more accurate:
