Hang Hang's number one obsession was volcano. He wants to read about all things volcano. And he talks about it all the time. Every details of disastrous eruption scenarios he talks about them repeatedly. Volcano is almost the only topic he draw, a coned shape mountain with some fume coming out of the top.
Later he became interested in all things tornado, how it can blow people, cars and houses into the air, etc. Sandstorm is another topic of his interest.
After months of obsession with natural disasters, he seems to have finally outgrown them. No longer is he talks and draws volcano all day. He has a new interested now, the T‑I‑T‑A‑N‑I‑C.
Now we watch videos and dissect all the details of the progress of Titanic's sinking. His artistic skill has finally move beyond cone shaped mountain. Now his typical drawing is a tipped ship in the ocean with fair amount of details. Plus there are people falling all over into the sea.
His brother, who draws fairly well, has taken inspiration from Hang Hang's old interest in natural disaster. This is he rendition of volcano, tornado and sandstorm.