Take one book you’ve found or been given, whether or not you attach great significance to it.
[In this case, I don't.]
Take two highlighters: one pink, one yellow.
Make two books out of one. Like so:
Now, you have two books in one.
Read the pink one, if you will; read the yellow, if you will.
If you don’t know what a battenberg is, click here.
Cool idea!