This is a clip from a Viking context image that has quite a few very strange features, and certainly warrants further study...

Here, perhaps the strangest is this row of four trapezoidal "frames", each of which may contain some ancient monument of great significance. The fourth "frame" furthest right can be seen here to have a dramatic appearance of containing a clear humanoid face within it.

The other three "frames" to the left of it may be eventually proven to contain artistic designs much more complicated... but no less significant.