So are you saying that as I watch a plane take off and get smaller and smaller as it gets farther away from me, I can't say that's perspective? I don't understand what you're saying.
Obviously if we know what it looks like up close, we know its size while in the air.
But what about something like the sun, which no one has seen up close? 30 miles in diameter? 300? 3,000? 30,000? Who's to say?
What if one bacteria creates a submarine and travels away from the cuttlefish, takes photos for the other bacterium to see, then comes back to show them.
That would depend how trustworthy the bacteria in the submarine is.
Has it been shown that the bacteria is faking its missions in a studio?
Has it been shown that the bacteria is falsifying records and deleting archival data?
Has it been shown that the bacteria is silencing critics and whistle blowers?
Has it been shown that the bacteria is going around giving fake moon rocks to heads of states?
If so, then the bacteria can't really be considered a reliable source.