Theres nothing overly new about flat network cables, but the Japanese company Elecom have announced LD-VAPF/SV05 network cabling, coming in at 1.4mm thick.

Given the cable is so thin, you can run it pretty much anywhere you like, especially under carpet, or like shown here in doorways. The Cat5 standard cables support up to 1000BASE-T, and are reinforced with aluminium.
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