<human>:  I have a question about the difference between top down and bottom up emergence. Where does the term “bottom up” come from?
<bot>: The term bottom up emergence comes from the fact that the emergence of complex systems is often a bottom up process. In other words, the emergence of complex systems is a process that occurs from the bottom up, rather than from the top down. For example, the emergence of life on Earth is a bottom up process, as it is a process that occurs from the bottom up, rather than from the top down.