Human proof design is design that prevents people from successful using the item.
It is similar to mistake proofing except instead of prevent mistakes it prevents people from using it.
When you see human proof design you will often see signs to tell people how to use the device that has been human proofed. Common instances of this are hotels that have shower designs so opaque they need instructions on how to use a device most people have no problem using if they are not human proofed.
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