What is this thing, you think? Try and look closely and think of the most subtle thing. It's a block of cans. Aluminium cans. What is it for? Water heating of course.
If any of you had done science, you might know that black absorbs heat. So the cans are painted black in order to absorb the most amount of heat from the sun, and the air inside is thus heated from the sun.
Apparently it heats up to 15 degrees higher than what you put into it initially. Quite... fascinating... to say the least. But yeah. I guess if you wanted to make one, you could click the link above.
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