violin

Here we see the Stradivarius "Lady Blunt" and Guarneri "Plowden" superimposed.

Move your curser (finger on mobile) verticaly on the screen to see one violin fade into another.

When the curser is at the bottom, you will see the darker Stradivarius "Lady Blunt"
and when your curser is at the top, you will see the lighter Guarneri "Plowden"

Note the corners and "C-bouts" of the violin body. 

Image Credit: 
Lady Blunt https://en.wikipedia.org/wiki/Lady_Blunt_Stradivarius#/media/File:Lady_Blunt_top.jpg

Plowden https://tarisio.com/cozio-archive/cozio-carteggio/guarneri-del-gesu-part-ii-1731-1740/