8 of Disks: Heat
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The suit of disks, in computing, is the brute physical fact of the computer as a machine. The eighth card in a suit is the principle of the suit exhausted, in motion, distracted energy. In computing, heat is exactly this - wasted energy in the most obvious sense.
Heat is waste, and even worse than that heat feeds back into the computer itself, damaging the device and slowing things down. Managing heat with heat sinks and fans and radiators and air conditioning and processor throttling is a big part of the world of computing we have today.
What is the product of the friction in your system. What is the exhaust of the system? How is that exhaust dissipated, and where does it end up?