I have a 1913 bungalow with what I believe is the original plaster in the bathroom, tooled to look like subway tile. Has anyone ever seen this or know what this technique is called? It also surrounds the clawfoot bathtub (floor to ceiling). I'm contemplating tiling that area over because of overspray from the shower, but am torn between preserving this unusual effect and having something easier to maintain. Would appreciate any thoughts on this, thanks.