[smallstepforman]

Unfortunately, our objects are not isolated, they interact with the world, and often need to be shared when we cannot copy the resource (performance). Eg. a (partitioned) rendering surface may be written simultaneously, a physics engine needs to know what objects are in the game world, multiple bank accounts need to be updated simultaneously, etc. By design is not always possible to sequence, some transactions must be atomic across multiple objects.

[ahasani]

Yes they are, atom is in isolation, cell has membrane, we have a body we have isolation and encapsulation in physics/chemistry/biology. In actor model message passing is interaction. Since you mentioned game, check out https://github.com/aeplay/kay, which is the isolation "objects" for https://github.com/citybound/citybound "physics engine". On multiple bank accounts, well an account is an actor, so there is no problem there, please have a look at http://proto.actor/blog/2017/06/24/money-transfer-saga.html