This illusion works only once… as far as you know. If you’ve never seen it, stop the video at 0:55, reset to 0:00 and watch it again. If you’ve seen it before, watch the entire video non-stop, then smack your forehead.
I first heard this song when I was 11. This song sounded so good, but I was curious as to what they were talking about. I’m like “Grandma, what are they talking about?” She looked at me for a minute and replied, “They’re talkin’ ’bout cuttin’ meat.”
[2nd & 3rd .gifs found here and here. Top .gif was created from video found here, uploaded to Giphy, stole it back since they don’t give credit or allow downloading anymore, messed with it using JASC Animation Shop. Background story here.]
“This illusion was discovered in an old photograph of two lovers sent to Archimedes’ Laboratory, a consulting group in Italy that specializes in perceptual puzzles. Gianni Sarcone, the leader of the group, saw the image pinned to the wall and, being nearsighted, thought it was a single face. After putting on his eyeglasses, he realized what he was looking at. The team then superimposed the beautiful Venetian mask over the photograph to create the final effect.”