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The world you were born into no longer exists.
(lemmy.world)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. The best ones are thoughts that many people can relate to and they find something funny or interesting in regular stuff.
It's the opposite: the past doesn't exist anymore and the future is only imagined. All there is is the now.
But what is the now? It is a sliver of time that has no thickness. It is a point in time that well... has no length of time. 0 picoseconds. Thus does it even exist? Your entire perception is of things that only occurred in the past. When you say 'right now', immediately the now you are referring to is already the past. And like you say, the past doesn't exist anymore either.