Ada Lovelace Illusion
Ada Lovelace is regarded by many as the first computer programmer. The most famous image of her, which was used as the basis for this illusion, is a portrait by Alfred Edward Chalon painted in 1840 and now in the Science Museum Collection.
When you look directly at the illusion you only see stripes. When you look from the side you see the image.
The illusion can be knitted in any thickness of yarn. The original is in DK and measures approximately 75 cm x 80 cm (30” x 32”). It used about 470 metres in each of two colours.
Illusion knitting is very easy to do because you are only using one colour at a time to knit stripes.