The entire structure is built up by looping the threads with out stitching them to the surface of the cloth.
I have posted loads pictures which I feel would be easy to follow so please if you have any questions don't forget to ask...I'll be happy to help :-)
Step 1: Supplies
Crochet threads of your choice
Embroidery scissors (option)
Since my picture is not clear ,I write below in detail which you can follow it up looking at the picture.
Step 1: Bring needle out at 1 from the wrong side of the fabric to the right side.Insert at 2 and bring out at 3.
Step 2: Insert at 4 and bring out at 5.
Step 3: Insert at 6 and bring out at 7.
Step 4: Insert at 8 and bring out 9.
Step 5: Pass needle under 3 and 4 insert at 10 and bring out at 11.
Step 6: Insert at 12 and bring out at 13.
Step 7: Insert at 14 and bring out at 15.
Step 8: Pass needle under 9 and 10, insert at 16 and bring out at 17.
Step 9: Insert at 18 and bring out at 19.
Step 10: Insert at 20 and bring out at 21.
Step 11: Pass needle under 15 and 16 and over 3 and 4,insert at 22 and bring out at 23.
Step 12: Pass needle under 1 and 2,and insert at 24.
For interlacing stitch follow step 13 to 16.
Step 13: Bring needle out between 1 and 24 at point A
Step 14: pass needle under23 and 24 over 3and 4 and under 2 and B
Step 15: Pass needle over 3 and B and under 2 and 1 pull for right tension.
Step 16: Pass needle over 22 and 21 and under C and D
Step 17: Pass needle over E and I and under 21 and E
Step 18: Pass needle over 17 and 18 and under 16 and F
Step 19: Pass needle over 17 and F and under 16 and E and pull for right tension.
Step 20: Pass needle over 19 and 20 and under 18 and G
Step 21: Pass needle over 19 and G and under 18 and 17. And pull for right tension.
Step 22: Pass needle over 21 and E and under 20 and H.
Step 23: Pass needle over 21 and H and under G and H and pull for right tension.
Step 24: Pass needle under E and F
Step 25: Pass needle under E and C
Step 26: Pass needle over I and D and under I and 15.
This completes the interlacing of one square.Complete the interlacing of the other three squares in similar way.
CONFUSION.......Keep trying you will succeed. Good luck.
Step 3: Creating the Design
Step 4: Transfer the Image to the Cloth
NOTE : When you look at the pictures ,it seems easy,but it is not so.There has to be a lot of concentration in how you do the stitches.If you make one wrong move in passing the needle under/over,later you won't be able to do the interlacing.Then you have to remove the entire stitches and re start.
I have been doing this for more than 10 years now, still I made a wrong stitch and had to re start over again. The tiny little holes you see on the material is the mark of unpicking the threads.
The material is just cotton thread ,it shows like cross stitch material when it is enlarged.This is not cross stitch.