That was a good while ago now and I've neglected my blog since, so here's some of the pages I made for the book 'Totally not a Spy Manual'.
Front cover, black holes were cut out to make eye-holes/reveal the mirror page underneath. The original plan was to make a newspaper but printing costs/difficulties came into play and so we downsized to a rough A5 shape for our book.
This page was printed on acetate, with mirror sheet sticker on the left side (reverse). The idea was that you could look through the mirror sheet and through the eye-holes in the cover without people realising because all they'd be able to see is 2 mirrored circles. However it turned out the mirror sheet wasn't see-through on the reverse side. We put it in anyway.
(highlight below to reveal hints)