A large magnet. A magnet, regardless of type, is quite heavy. Especially if it's a rather dense one because it'll weight more because of more mass occupying a small space. It's a magnet because of the box's attraction to the steel table rather than concrete. Magnets attract metals instead of concrete.
Answer:
For many postmodern writers, the various disasters that occurred in the last half of the 20th century left a number of writers with a profound sense of paranoia. They also gave them an awareness of the possibility of utter disaster and apocalypse on the horizon.
Explanation:
"To take care of all it's needs". If a large creature's needs can not be met, it will die. Therefore, this would be the answer to your question.
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