Collectors relish so-called “hidden mother photographs” as historical oddities.

These 19th-century images contain very young children held still by half-obscured adults who crouch behind chairs or lurk at the margins of pictures, their protective arms stabilizing babies. The heads and shoulders of the adults are sometimes draped in textiles or summarily cut off, or their bodies are partially tucked behind decorative mats that frame the centered child.

The startling realization that Victorian infants were not reclining on cozy blankets but on comfortable laps fuels breathless online attention. Eager resellers of flea-market finds advertise hidden mother photographs using terms like “spooky wonderful,” “cutie creepy” and “bizarre.” Articles about them tend to imply a treasure hunt for hiddenness – for adult knees or noses, poised hands, bosoms, hat brims and skirts.

But this common framing reduces their cultural importance to sensationalism: Look at how kooky our ancestors were!

As someone who has studied the history of these photos, I find myself drawing an unlikely connection between these stiff, sepia portraits and modern candid snapshots of mischievous children delighting their adoring mothers. Both are part of the tradition of sentimental image-making that surrounds the iconic figure of mother and child.

Exposure times in 19th-century photography were very long by current standards – 20 to 60 seconds – which helps explain why trusted adults were needed to soothe infant subjects into the stillness necessary to take a portrait. But this technological limitation doesn’t explain why their mothers were half-erased from these photos, which has led........

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