Lovely Antique Pennsylvania Cutting Board with Mysterious Toned Shapes

I found this one in Pennsylvania, and though I don't know for sure, it seems to me it might have been tin quilting templates that sat on this cutting board for a very long time, leaving their silhouettes behind. Whatever the case, feels almost like a photogram, with a nice sense of mystery to it. And with the wooden board very well used before or since, with knife marks all over. Quite lovely and painterly feeling.

13 1/8" x 9 5/8" x 7/8". Knife marks and some stains as evident, all to the good in my opinion.