According to Wikipedia’s definition a museum is:
”an institution that cares for (conserves) a collection of artifacts and other objects of scientific, artistic, cultural, or historical importance and makes them available for public viewing through exhibits that may be permanent or temporary”
and, theatre or theater is:
”a collaborative form of fine art that uses live performers to present the experience of a real or imagined event before a live audience in a specific place. The performers may communicate this experience to the audience through combinations of gesture, speech, song, music, and dance. Elements of art and stagecraft are used to enhance the physicality, presence and immediacy of the experience”.
Sometimes in the future our goal is to read on Wikipedia a definition like the following one:
”A museater is an institution that cares for (conserves) a collection of stories (storyworld) of scientific, artistic, cultural or historical importance, helps people to experience them in contexts where their educational and emotional impact is maximised, and facilitates their re-use and diffusion”.