Negative space embroidery, leaving plain fabric for the letters and stitching around the outside. Looks amazing - would be great for a bold front cover title. Embroidered greetings by UK graphic designer Emma Smart.
Negative space embroidery: Embroidered lettering by Fallon Horstmann, via Behance
This element of design is Negative Space. The hand isn't actually holding anything. It implies that there is a light bulb in the empty space. Negative space guides your imagination to finish the image.