Radiating mechismo...
"Blush is a radiator by Icelandic designer Thorunn Arnadottir that is covered in thermochromatic paint and both looks like and simulates capillaries. She says, 'Blush is a very important organ of the house. Regulates the temperature and keeps it warm and alive. Blue when cold, but blushes with red when warm.'"
https://laughingsquid.com/blush-a-radiator-that-simulates-capillaries-blushes-red-when-warm/
My Source:
IDN, 2012. Volume 19, NO. 3. 080.
See also:
Book: The Vital Question