It wraps a value into box and whenever you modify box it triggers events and you chain these boxes together so whenever there is a change in one box, it passes

It wraps a value into box and whenever you modify box it triggers events and you chain these boxes together so whenever there is a change in one box, it passes the value to other box. Because one box can hold the other and vice versa. Everything is resolved at compile time, there isn't any dynamism involved and neither associated objects.