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A term used to describe a person who sees the physical reality we all share as a fundamental importance, to the point that any artifical or virtual realities are considered bad or harmful.

Now, this doesn't just mean someone who feels physical reality is important - as we all know there are certain realities about it that require being taken care of, such as food, water, shelter, and the like - no matter how great the artifical reality is, it won't be able to completly make the physical one disappear. Even technologies like uploading wouldn't alter that either - the computers that now store the person and their new reality are in this reality we live in now.

It means a person who feels that this reality is so important, that all others are merely distractions, a waste of time and/or energy to anyone who would participate in one, and may somehow adversely affect anyone who uses them.