okkk. this is just so cool. i tink the lecturer so cool.. always tell us very fascinating stufff! hahhaa. ppl look carefully at the pic... they r inverted versions of each other!! SO COOL HUH... they r drawn by this artist called Gustave Verbeek! very very long ago le.. he used to draw comic strips or something lidat for a newspaper or something.. then he drew a 12-strip one.. or watever u call that.. yeap. but due to space problems or something.. the editorial board demanded that he reduced his comics to a 6-strip one.. so he got this very serious problem.. then he came up of this way of drawaing comics with pictures that can be inverted n still look logical n stuff.. so he will tell the people like u finish looking at the comic, invert the newspaper to see the other half of the story.. hahaha so cool rite.. n he actually successfully make it into some story lo.... SO LIHAIIIIIII!!!! hahaha. i really gan bai xia feng~ hahaha n ya.. he drew 60+ such comic strips! hahaha really super coool~~~