Agreed, I just tried it. Two good examples for this are the ones in the Wikipedia page [0]. The size in the page is maybe a bit large, if it requires a too larg

Agreed, I just tried it. Two good examples for this are the ones in the Wikipedia page [0]. The size in the page is maybe a bit large, if it requires a too large angle of eye crossing: hit Ctrl - a few times to zoom out. [0] https://en.wikipedia.org/wiki/Spot_the_difference https://en.wikipedia.org/wiki/Spot_the_difference