[ryannielsen]

It doesn't just look thinner. It is thinner. Yes, there is a hump around the base's hinge, but it is still significantly, noticeably thinner – per the article, the machine's volume was reduced by 40%.

[maggit]

I believe the reference thickness the parent was referring to was the thickness of the same iMac, not the previous one. In other words:

If you take pictures from the right angle, the computer looks thinner than if you take pictures from the side showing the entire bulge and stand.