Sometimes we see things and think nothing of them, or they appear quite tiny. Then you see them in perspective and they can become quite big things (or small on the other hand). But I’m not being philosophical, merely trying to introduce the following two images to show how perspective in imaging works. To ascertain the true size of something, you need a comparative object to create perspective.
Take this picture for example. A nice scene showing the Ceratodus overnight rest stop about 20km North of Eidsvold in Central Queensland. Nice campground. A few trees. The one in front looks normal…
But it is somewhat larger than it looks
Here your lesson in perspective endeth.