Complete Set of 25 Ogden's Optical Illusion Cards, 1920s pewter box The ones with the red

The ones with the red markings (Roman numerals I denoting their point values) are a bit heavier in weight and somewhat easier to pick up

most likely due to the association of the color red with good luck

Pieces measure about 4 1/2” long

and now these fantastic bone ones

This hide used for this one has been stained black

Complete Set of 25 Ogden's Optical Illusion Cards, 1920s pewter box The ones with the redThis is a complete set of British Ogden Cigarettes "Optical Illusion" cards, included as freebies inside cigarette packs, and which someone very diligently collected to have all 25 that were issued. I think the graphics on these are just fantastic, and might argue they they are the best looking set Ogden's ever produced, and they produced a lot, beginning in the late 19th century. On the back of each card is an explanation of each illusion, or in some