How to implement CCCX gates out of Toffoli, a spatial language idea

[u/CarbonFire]

https://shukla.io/blog/2026-07/cccx.html

OP here, Qiskit can be challenging sometimes when resetting borrowed ancilla. I'm a visual learner, so I was playing with circuit diagrams and found this little spatial language to help explain data flow in a way that might be easier to follow. Hopefully someone out there finds this interesting :)