Have stereograms advanced in some way over the past 30 years? I know how silly that sounds, but: I remember back in the day when the fad first broke, spending minutes, many minutes, trying "get" it. And having to focus (heh) on focusing my eyes. And sometimes failing. I haven't looked at a stereogram since then until now.

And these were easy. The first one literally took 15 seconds to "drop in." The second maybe ten. The third was near-instant. The only one that gave me any trouble was the continuous function one like an egg crate, with no sharp edges, just dropping down and up. That took maybe twenty seconds, and once I recognized what I was looking for, it was easy.

So has the technique changed/improved? Or has my brain changed?