Curves and triangles, as we have seen, can really help to create a stunning images. This week's theme is somehow relative to this very purpose too, but digs more deeper into viewers perception.
Please, take a look: How to Engage Your Viewers by Creating a Moment of Discovery (while some examples there may not be the best ones, the whole idea, as for me, is captured quite well).

(Photos for the Week #18 competition were to be taken between Apr 15, 2013 and Apr 21, 2013.)