For me optimism is two lovers walking into the sunset arm in arm. Or maybe into the sunrise - whatever appeals to you.
It isn't what you have, or who you are, or where you are, or what you are doing that makes you happy or unhappy. It is what you think about.
It's - as opposed to tape where you have a magnetic tape that's excited by frequencies that you hit, digital was a process where musical sounds are transferred to numbers and stored as numbers.

