Google seems to have decide that red equals "create" -- all the new designs have a red button for creating a new message / document / ... My brain's having a l

Google seems to have decide that red equals "create" -- all the new designs have a red button for creating a new message / document / ... My brain's having a lot of trouble with this. I'd be really interesting in the reasoning that went into re-mapping a color usually used for "stop" or "delete" or "danger" onto "create".