As most ads have copy, this one caught my eye. On the header of instructable, it was just a series of images. And the first think which came into my mind when I saw the ad was what is it. And when I was about to click it I realized it was an ad. I guess more people are deliberately shying away from clicking on ads. Which is making ad designers create ads which do not look like ads.
oversmart.
That could be one way of looking at it. But seeing that it is on instructables, which has users whose average curiosity is more than the outside average, it might work too.