A similar interesting octopus story not mentioned in the article: A particular light in a German aquarium kept short-circuiting and no one could figure out why. Using camera surveillance it was finally discovered that every night, the octopus would climb to the edge of his tank and shoot a jet of water on the light, shorting it. It was speculated that the light had been bothering the octopus' nocturnal routine. http:…
Their answer was to hang the light higher. No explanation for keeping the nightly illumination.
Let's not attribute any aspect of his behaviour to the crippling reality of captivity. Oh, no.