It was the first semester of my sophomore year. I had just done the most dynamic design sketch ever done of a butter dish with lid, from an ant's perspective. While I thought it was cool, my instructor couldn't tell if it was a butter dish, or some kind of modernist housing block. He then did something like the below demo I've done for you. This illustrates the importance of selecting a proper perspective in communicating your ideas.
Three rectangular forms of similar proportion in space. You can see how the perspective already implies scale.
With just a little form added, you can see how quickly the right perspective helps.
Now with appropriately scaled details and backgrounds, the three rectangles that are the same proportion, have totally different scales.
