This is a viral example of pareidolia, a psychological phenomonenon that causes us to see meaningful things in nebulous stimuli, most famously faces. But the caption it comes with—"Does this image upset you?"—is even cleverer. In blacksmithing, "upsetting" refers to the activity depicted in the illustration: making a bar thicker by bashing it lengthways.
Previously:
• Computer finds faces in grains of sand
• Mops with attitude: hilarious mop pareidolia
• I hear phantom music when I use a white noise machine, and I'm not alone: understanding auditory pareidolia
• Francois Roberts amazing collection of objects that induce Pareidolia
• Pareidolia in nature: discovering eye-shaped wonders in the landscape
• Vegetable Pareidolia
• Pareidolia subreddit
