perspective

A flat earther showed me this video where Eric Dubay builds a small scale model consisting of block towers of the same size, and from a certain angle it does not appear to obey linear perspective, and the block towers appear to curve downward, despite apparently being in a straight line on a...

Please find attached an excel spreadsheet containing a calculator which works out the viewing (elevation) angles for an observer of a given height on both a flat and sphere earth, from distances and elevations. This is what it looks like: For the flat earth, it's simple trig - tan(x)=(target...

Perspective is difficult, both to understand and to explain. This was recently brought home to me listening to flat earthers Nathan Oakley and Anthony Riley attempt to explain this photo of mountains in Washington and Oregon: All decent analyses show that it aligns perfectly well with a globe...

I was thinking about the popularity of conspiracy theories. You often see surveys that say things like "12% of the population believes in some 9/11 cover up (or chemtrails" There’s several quite popular YouTube personalities who make Flat Earth their focus. It’s not always clear if they...

The above image appears to show three different metal rods. The left rod is short and straight. The middle rod seems longer and angles sharply to the right. The right rod appears slightly curved, and has a longer segment going off the edge of the photo. Actually the rods look like this...

Which of these two planes is higher? And where are they exactly, relative to each other? Now your first impression might be that it's fairly obviously plane B, on the right. It's visibly smaller than the left plane, so must be farther away, and its contrail is obscured by plane A the left...

In this video, the speaker, Dane Wigington, shows a photo of a plane leaving contrails, viewed from an acute head-on angle, and says: "As we see aircraft like this, normal condensations trails do not immediately emit from the back of an aircraft, and certainly they are not plumes like that...