I've posted before about the Droste effect, named after the Dutch chocolate tin, or recursion, as it is properly known. (I've always known it privately as the Bycroft effect). It is related to my blog title, and has always intrigued me.
Recently my son brought something to my attention. If you type 'recursion' in the Google search box, the first line will read 'Did you mean: recursion.' And of course if you click on that, you will begin an endless recursive journey. Nice to see someone at Google has a sense of humour.