DAK of a source on the web for pictures which can be interpreted two ways - there's a well known one of either two people or a wine glass, depending on how you interpret it, one of rabbits, another of birds and doubtless many more, but I can't find them, largely because I can't think of suitable search terms! Can anyone help - the more piccies the better!
Try "ambiguous figures"John
Hello YramNos,you might find what you are looking for here:-http://www.optillusions.com/HTHBob
and some more here:-http://members.lycos.co.uk/brisray/optill/oind.htm