Book Mark by Nahuel Olivera - Trick

Today, we know many routines about mentalism thanks to books, but for most of them you need a special book... but thanks to this creation your job will be easier.

EFFECT: The magician makes a prediction and asks a spectator to open a page in the book, which says the number page or simply choose one randomly while going quickly through the pages. The artist has on his hand a TRANSPARENT bookmark and the viewer will tell where to place it: on the first lines of the page selected, in the middle or the end of it... after the spectator's free decision (both the page and where to place the bookmark), the illusionist will show him the transparent bookmark has a line, and that it highlights a word on the text... the viewer reads the word and it incredibly matches the prediction!