It's quite amazing - reverse applique in that ever decreasing shapes are cut away to make the coloured outlines, and also needle turn applique in that the raw edges of each layer have needle-turned under and stitched. Additional detail is then hand quilted on.
I googled the technique (Mola), and found that these usually have between 3 and 7 layers of fabrics: nearly all have black layers, but the other layers are usually brightly coloured
I only went for 3 layers in my trial sample, and used fleece so I could avoid the needle turn bit, and think I need to take a bit more care cutting away the shapes, but I quite enjoyed doing it, so will be getting a few more pieces of felt over the weekend, to have a better go
Last weekend husband and I took both mothers (!) to Bletchely Park. Partly to see the history of the code (cypher) breaking during WWII, but also to see the quilt exhibition.
This fab map of the site was on show as were loads of other great quilts using the theme of secret codes.
I loved most of them, but this one particularly caught my attention as I have also used braille in a quilt recently. Some great interpretations of the theme.