Ok hopefully this is simple and easier to understand how the actual graph is made.
I have made 2 graphs they are identical stitch wise, however, for one I left where the illusion pattern is worked in white, for the other I filled in the whole graph.
The pink lines represent pink in my finished photo
the yellow lines represent white in my photo
when you come upon a white square in the graph keep going with the same color you are using in that row, just change the stitch you are doing.
chain 14 with background color (or any more then 14 and place this in there but has to be at least 14)
then starting from the bottom work up the graph (left to right or right to left doesn't matter as long as you always work the same way)
Carry your colors up the side and don't cut. If you do this nicely you'll have a fairly nice edge to either crochet a border to or to leave alone as is.
oops forgot a key
sc = single crochet
bl = sc in back loop only
f = sc in free loop from row below
here is the graph with the pattern stitches whited out
same exact graph just all colored in to see it's 2 lines of background color and then 2 lines of image color worked in stripes
finished straight on view.
You will see a little bit of the pattern depending on the yarn you chose, how tight your stitches are and such. You can play around with the ridges raising them up more so you don't see as much of the image straight on, and, the camera is actually picking up more of the illusion image here then the naked eye sees.
sorry it's blurry but you still see it. Here's a half note done in illusion crochet.
I used worsted weight yarn for this (white was RHSS, pink was caron simply soft) a size g hook
Gauge: in pattern stitch 4 stitches by 5 rows = 1x1 inch
my finished piece is 3.25 x 6.25 inches as pictured above
These pieces generally do not require blocking, but, if you do block them or find a need you can steam them from the back or front but don't press an iron to the material as it will flatten and possibly distort the ridge.
Adding: The yarn you chose makes a slight difference. The bulkier the yarn the more elongated the illusion pattern, the smaller the yarn the more squatty the illusion pattern, just like in illusion knitting if you know how.
So if you want a longer (top to bottom) note, use a bulkier yarn, if you want maybe a fatter yet shorter note use baby weight or even thread (which is totally cool this can be done in thread as most knitters don't use crochet thread)
Now you can take this graph and expand upon it (for personal use only please) if you want notes right next to one another then add a few stitches in between the illusion image. Like on the graph above on the right hand side you should see there are 2 stitches bordering the image all the way up. If you'd like to add another note to the right just add 2 more of the same stitches following each line to separate it out more (or however many you would like to)
If you would like notes on top of one another finish the graph then
line 35: sc in free loop on row below across in illusion color
line 36: sc across in illusion color
then start over again from line 1 on the graph or keep going with line 33-36 until you have the space desired before the next note starts.
Now I would never dissuade a new crocheter from trying this and it's not hard, it's all single crochet, but, you need to know the make up of a stitch well and have fairly consistent gauge.
You'll need to know how to single crochet, crochet in the back loop only, know the construction of a stitch (both loops, back and front loops), how to pick up the free loop, how to turn, where the end stitch is, how to carry the colors up the side.