| http://www.w3.org/ns/prov#value | - and larger than they are, I have seen those sometimes, perhaps a few hundred meters up.Some probably made deliberately by enthusiasts, like this one:and others, balloons for some celebration, that were released either by accident or on purpose, and can be quite large.Also weird flying machines made by enthusiasts, such as radio controlled UFO like models designed to look like a UFO.Here is a radio
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