we have no way to tell if something is flat or not ?

Over 4 miles.... Seems implausible

We do, but over that distance no object has been made that large

how big is the base of the great pyramid?

Untenable method

Not 4 miles wide

@The Big Gambino A string might work

And how flat is it

@Bannebie even that forms a canternary

With enough tension on the string?

yeah they have 30 pound test bouyant fishing line that weighs like 5 pounds for 4 miles worth of it

so the line floats but you would do it over the water anyways

30 pound test and the 4 miles weighs say 10 pounds tops

No, even with high tension there is still sag

is it strong enough idk

Small, but not flat

Catenary

https://en.m.wikipedia.org/wiki/Catenary

Hm..is there a formula that could be used to calculate the amount of slack depending on distance, tension and material?

@jeremy think of a doable experiment

@Bannebie yes there is

it cant be optical since we know illusions take place have to be physical

something to prove the curve physically not by what we see

K so no lasers, and not flat objects.

yes 4 mile flat object

What's left

None exists

we cant make something ?

How

How do you make a flat surface

Esp that large

their is a spaceship orbiting earth with humans living on it we went safely to the moon and back

we cant make something straight and flat for 4 miles

I mean that's the limits of materials

i have no idea how to make a flat surface im not gonna lie

So this isn't a realistic method of proof

if u threw me in the woods and said make a flat surface

if i had tools i could make a flat surface

<:CHECK6:403540120181145611> @Bannebie has been warned
```
reason: Bad word usage
```

fsjhuhsdfgujsfdgsfd

The problem isn't that it's flat, the problem that four miles is huge