case class persistence visualized

Example.scala

case class Street(name: String, house: Int)
case class Address(street: Street, city: String)
case class Person(address: Address, age: Int)

val person1 = Person(Address(Street("Functional Rd.", 1), "London"), 35)
val person2 = person.modify(_.address.street.house).using(_ + 3)

/*
     ┌───────────┐     ┌───────────┐        
     │Person (35)│     │Person (35)│        
     └──────┬────┘     └──────┬────┘        
            │                 │             
            v                 v             
      ┌──────────┐      ┌──────────┐        
      │Address ()│      │Address ()│        
      └──┬────┬──┘      └───┬───┬──┘        
         │    │             │   │           
         │    └───┐         │   └─────┐     
         v        │         v         │     
   ┌──────────┐   │   ┌──────────┐    │     
   │Street (1)│   │   │Street (4)│    │     
   └─────┬────┘   │   └─────┬────┘    │     
         │        │         │         │     
         │        └─────────┼────┐    │     
         │       ┌──────────┘    │    │     
         │       │               │    │     
         v       v               v    v     
 ┌───────────────────────┐ ┌───────────────┐
 │String (Functional Rd.)│ │String (London)│
 └───────────────────────┘ └───────────────┘
*/