He covered the interior of a house with giant blue crystals.
But god, all the glue-gunning sounds so exhausting.
So, instead, he sealed the house, and poured in from the top ~90,000 liters of copper sulfate. A few weeks later, he drained the house. (I'm presuming it wasn't as dramatic as, say, opening the door and letting a flood of blue flow out.)
Personally, all sarcasm aside, I think it's a pretty cool project. It reminds me a lot of photos from the Poles, with the ice crystals clinging to everything. It also is a cool example of how substances bond into crystalline shapes, and lord knows how I love bonding.
More details here and here.
(via apartment therapy
