car ad

I saw this advertisement in internet through the searching.
this is a car ad about mini cooper.
I saw this pictuer first, I didn't recognize this illusion
and I think this is a just direct advertisement about mini cooper isn't small
but after a few seconds, I realized that it is an illusion and this picture was just timing!
So I think this ad was very clever.
and I don't know exactly but I think this ad effect is similar to 'the power of suggestion'