On a DDR
, the devices will be enlarged. When they are normal size, it is not showing hub doubling. Here is a great pair of images to learn from.
Can you tell a difference between these two images?
Now take another look at your coin. Note the devices are the same size as the normal example. Seeing stuff side by side will help you to tell normal/enlarged/reduced size of devices. Little clue like the insides iof devices:
There are two DDOs and one normal coin. Can you spot the differences?
Same coins, but different areas on the coins.
Seeing coins side by side allows you tell detail differences:
Spot the differences on these two different coins?
Create images as side by sides allows you see see exactly how they are same or different.
It allows your eye to focus without trying to remember when you move you eyes from one place to another. You don't loose perspective that way.