But at least that way, we wouldn't be forced to make a game of object permanence out of thin air, or live in a virtual world where nothing of value was created after March 2018. (io9.gizmodo.com)
Do children really not fully understand object permanence until they are 2 years old? (positive-parenting-ally.com)
Human children do not develop object permanence until they are 2 years old. (littledogtips.com)