UK-based Rob Ives spotted this unusual DIY hinge. As he explains:

Ives, by the way, is actually a designer of build/make kits for kids. You can check out his stuff here. Stainless Steel Self Closing Hinges

Here's another clever build, for a fence that allows you to step over it (source unknown):

Lastly, one other DIY way to prevent an animal from escaping a fenced-in area:

A modern equivalent is the self closing barrel hinge. Available, though not oft used, gate hinge for welded construction. Elegant and simple. https://www.hardwaresource.com/self-closing-weld-on-hinge.html 

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