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A new type of automatic door is presented at japan tech fair.
The idea is that the door is made out of many pieces where has a motion detecor and as you approach them they open just the parts of the door needed for the object to pass through.
For example passing a cardboard box would open the doors just so it fit through.
They can probably pay back in places where heat needs to be conserved as much as possible. By opening just the right dimensions no heat is lost.
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