Scire ubi aliquid invenire possis, ea demum maxima pars eruditionis est.

I suggest buying a copy of that 'curiosities' book as I think this is another from it - from memory there is a photo of a figure picked out in white stones in a wall, knowing the depth of research that went into the book I leave it to your judgement as to whether worth following up - presumeably one of the readers on your other site has obtained a video for Xmas