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David AtkatzA museum is a "permanent institution in the service of society and of its development, OPEN TO THE PUBLIC, which acquires, conserves, researches, communicates and exhibits, for purposes of study, education, enjoyment, the tangible and intangible evidence of people and their environment."
If it doesn't have to be open to the public, than Barry Halper did have a museum.
As do I.
And most of us here.