That reminds me of one; When you stare at someone, you are not seeing them in the present, you are seeing them in the past. To account for the time it takes for the light to bounce to them and back.
Everything is always floating, unless it's falling. And everything is always falling, due to gravity - unless you take "everything" as a single unit. And if "everything" is floating, what is it floating in comparison with? The logical conclusion, of course, is that the universe has a center, and "everything" is just expanding and contracting away from/towards that center. But if the universe is changing size, what is it changing size in comparison with? And if it's not changing size, and the parts within are just changing in proportion to eachother, than everything in the universe must be constantly shrinking. But wouldn't that defy the law of conservation of mass? I could go on, but I'm starting to get lost here myself...
Pretty much, if you assume the universe is expanding like a circle or a sphere. Which seems like a pretty big assumption to me, considering the way stars are spaced out.
Though the magic of 3D graphics necessitates the qualifier "physical" object for the statement to have any real weight behind it. These days if you go mentioning "walls with only one side," most of the younger folks and gamers in particular are more likely to think of glitches & clipping issues.
Here's something to leave you thinking; Does a mirror reflect everything, or does it not? If it doesn't, what does it look like where it stops reflecting? It might be reflecting everything as a "Parallel universe" because it will show more depending on the angle you look at it from, but you really have no way of knowing.
When a video gets uploaded to YouTube it sticks at 303 views for a few days while the count the 'real' views. You can have fire underwater.
