I'm not an engineer, but I can't stop watching this hypnotic and oddly satisfying video of tying rebar.
From World of Engineering.
The tool in the video is identified as the Makita XRT01TK 18V LXT Lithium-Ion Brushless Cordless Rebar Tying Tool Kit (5.0Ah).
You know, for all your rebar-tying needs at home. Or to calm you down when life gets a bit much.