As ever, your observational initiative wins the day, John.
And what better occasion on which to blow those pipes!
...and discovered, rather serendipitously, when I actively "looked for" something, whether it'd be pipers, scolls, ox/donks, or lambs,
...that the paintings/artworks took on added character and deeper meaning.
EG: I just happened to notice that in many instances, the ox was portrayed more in the light, more 'present', whereas the donkey was more often in shadow, maybe to suggest 'in the (dimly seen at the time) future'.
Try it for yourselves maybe....see what happens...say, which of the paintings contain an ox/donk + lamb + scroll + piper? 2 out of 4? 2 out of 3? etc. Might be interesting for you as it was for me. I hope so!