The pool is 7′-4″ deep where it meets the neck. It is possible that the body and neck could hinge due to differential soil settlement so extra reinforcing steel was added, reminiscent of the violin strings.
Similarly, the koi pond “bow” crosses the neck with acrylic windows separating fish from lap swimmers. Extra reinforcing was added here too and resembles the horse hair used for real violin bows.
This is the type of special structural engineering that Watershape Consulting is known for – we are creative problem solvers.