I think the method is sound but the phrase choices are overly difficult (for example, the word "stereoscopic"). Sure it weeds out spammers, but also real users. I have had a few people message me through other channels (ie YouTube) telling me they couldn't get past the spam protection and wanted to join the site. Just saying.
A few months ago, I added a line "Please email firstname.lastname@example.org if you can't unscramble the sentence". So if people are having trouble, they can get instant help. We've received a few emails since then.
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