A [possible_individual] is a [thing] that exists in space and time. This includes: - things where any of the space time dimensions are vanishingly small, - those that are either all space for any time, or all time and any space, - the entirety of all space time - things that actually exist, or have existed, - things that are fictional or conjectured and possibly exist in the past, present or future, - temporal parts (states) of other individuals, - things that have a specific position, but zero extent in one or more dimensions, such as points, lines, and surfaces. In this context existence is based upon being imaginable within some consistent logic, including actual, hypothetical, planned, expected, or required individuals.