Matt BlazeEvery time I have to solve a captcha I'm forced to confront unresolvable semiotic edge conditions. Is the post that supports a traffic light itself part of a traffic light? I just don't know. I am inadequate to log in.
Cassandrich@mattblaze Psst. Spoiler. It's a game to see how much wrongness and chaos you cam get away with to sabotage the training data. Ambiguities like this are your friend.
ArneBab@dalias I usually add a click to a wrong tile at random … I wonder whether there’s someone somewhere with the sorry task to identify all those people whose input sometimes breaks the model and filter them out.
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Sam Thurston 
@samthurston and the crowd has the wisdom to add errors to prevent overreaching misuse of their work ;-) @dalias @mattblaze