Three types of blocks are sewn together to form a repeating lattice pattern. The pattern is given in three ways: a detailed phototutorial, printable written instructions, and charts.

The general technique used is overlay crochet. The background stitches are back-loop-only single crochets. The pattern stitches are longer stitches (dc, tr, dtr) worked into front loops or around posts. Each block starts as a magic loop, and is worked out in a spiral. Blocks are joined by sewing, with some extra care taken to make the pattern lines continuous as they cross from one block to another.

The pattern only shows on the right side of the work. The wrong side is an undecorated grid of squares.

This pattern is based on the lattice screen on the left side of the painting Kuran okuyan kız by Osman Hamdi Bey.
The lattice pattern is made with a repeated circular motif.

Materials
Aside from yarn and a hook, you’ll need a tapestry needle to sew blocks together and weave in ends, and 4-5 stitch markers.

Using a 4.0mm hook, I made a baby blanket using 1700 metres of medium weight yarn.

Gauge
The part of your gauge that matters is how tall your double crochets and trebles are compared to your single crochets. If you find that the piece is puckering, replace all “long” stitches with a stitch one size longer. That is, you can replace double crochets with trebles, replace trebles with double trebles, and so on. Other than that, gauge is not important -- a larger gauge will simply make a larger block. A finished block has 31 stitches on each side.

Yardage
The blocks in the phototutorial were made using Soft and Shiny by Loops and Threads. It cost about $5 at Michaels per skein, and one skein (285 m) made about six blocks. I used a 4.0 mm hook. One block measured 6 inches on a side.

Difficulty
This is an intermediate or advanced beginner pattern. In order to correctly place some of the stitches, you should be able to look at the work you’ve already done and reliably identify which are sc, dc, or ch.

Keywords: lattice, iron work, screen, mashrabiya, Turkish, Ottoman, Middle East, Celtic knot, wrought iron, lace, overlay, front post, art, painting, ornate, intricate, Osman Hamdi Bey

Update: LVA Version
I tried to add a low-vision and screen-reader friendly version of the pattern. This is the second PDF you’ll see if you click ‘download.’ In that version:

• All text is in black, on a white background
• Font size is 22 pt Arial, with no italics
• Written instructions are provided (although there are charts in Section 8).
• Centred text replaced with left-­justified text
• Document has 1­inch margins
• Multiple columns have been mostly eliminated – the exceptions are small pictures side-­by-side
• All pictures have captions
• Page numbers are on the bottom left
• Headers and footers have no important infor­mation
• Abbreviations have been eliminated to the best of my ability
• Paragraphs have space between them 4

This pattern has not been tested with a screen reader (because I don’t know how). This type of accessibility isn’t something I’m versed in. If there are mistakes, you have my apologies.