I saw something in this stone column

So I was in this
Castle of the Teutonic Order in Malbork.
Huuuge Castle in North Poland.
It is so freaking Big, it cannot fit into one shot.
just kiddning. But it is Massive!.
Google it: "Malbork"

I took many photos and suddenly I saw something:
Do you see it?

I slightly outlined and enhanced it for you:

That's how my brain works, lol. :)