Rubbing, Spill, Imprint, Transfer
By indexical, I mean marks that are the residue of something, marks that are not direct, a result of your purposeful hand, but a result of indirectness - marks that record an action or leave a trace. In other words, you will remove your "hand" somewhat to allow for a new kind of image to develop. The important thing to remember is that you are letting the residue (drip, fingerprint, etc.) become the image. The unconscious mind starts to play, allowing chance to be a factor. Below are examples that will hopefully make it clearer to you.
You will make 4 drawings, explained in your handout, that reflect these different types of approaches. You can use these indexical marks as fields to deposit more literal types of drawing marks, or just leave them as they are.