Blot.re's landing page pretty much sums up...nothing. As far as I can tell, it's a way to have a status page much like twitter, but instead of posting a message, you post a color.
From reading the article it seems to me that it's not you, but your sensors that post the colour. So you specify the min/max range of your sensor values, a colour which is mapped to middle of that range and then the colour changes depending on the sensors current value.
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