For film that mainly focuses on documenting an odd, old man with very strange behavior, it's very well put together and is fascinating to watch.
As for the critique on here about not exploring the "Why?" surround his behavior, I think the film let's you answer that yourself. It presents all the information in a neutral way and doesn't form an opinion or spoon feed the viewer. Perhaps there is are no answers to - Does he know what he's doing? Is he a bad person? Is he malicious or does he think he's helping in some way? It's a tribute to the film that you aren't left with answers.
You'll be talking about this film long afterwards.
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