UPD 11/07/2021

I am glad to inform you about the update of this pattern. I added the written pattern and the charts for Overlay Mosaic crochet from bottom row by row and Overlay Mosaic crochet in the round.
Two writing patterns in one file The_Butterflies_mosaic_in_the_round.

Technic: Double filet crochet, Interlocking filet crochet
Type: Blanket / Afghan
Gauge: 10 sts by 5 rows in 5 x 5 cm (2” x 2”) in dc stitch pattern
As long as your windows are square, using a different gauge won’t affect the design, but it will change the finish size and the amount of yarn needed.

Hook size 3.25 mm. Hook size needed to match the gauge.
Approximate yardage 4000 meters of yarn for each of your two colors, which is a total of 8000 meters of yarn. (4375 yards per colors, a total of 8750 yards of yarn).

Size: 150 cm wide and 210 cm long (150 x 210 windows)

The pattern contains a graph and Right-Handed instructions.