It’s a common misconception that the average human height has just been getting higher and higher and higher as the centuries go by. Though eventually that will be the case, as we all become progressively bigger cyborgs and then eventually fuse Katamari-style into the singularity.
I know about it because I read about it on steampunk.
It’s NOT a misconception that future babies will have ruby quartz lens visors like the baby in the picture. That’s just where technology is going.