Have students think about a reference to an object as a numeric memory address to help them understand how passing references works.

Teaching students this deeper model of memory can often make more sense to them than something more abstract.
As such, have students conceptualize a references as numeric memory addresses, like 0x9FFF0 and 0x3106eb.
- When an object is passed, its memory address is just being copied to the local variable being used.

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