To the untrained eye, it looks like cooking food. But if you have such a wide range of interests and are as observant as I am, you immediately spot some peculiarities. Being there in person makes it easier, so I will give some hints.
The two brown bottles have no label like beer bottles do, and they do not contain beer. The color of the the liquid in the bowl behind the bottles is blue. There is furnace with a fan and glowing charcoal in the background.
Update: solution is here http://christianpfc.blogspot.com/2014/08/gold-purification-on-sidewalks-of.html
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