The author Dontbesogullible shared this image on wikimedia commons showing the blue eye on a baby's room door in a hospital in Turkey. The "nazar" that is believed to protect against the "Evil Eye". The believe in the protective power of "the eye" (العين as it is called in Arabic countries) against resentful looks is not limited to Muslim countries but a Mediterranean phenomenon. In Turkey, this symbol - most commonly made out of blue glass - is of unrivalled circulation and applied as a motive to almost everything, from bedlinen to chewing gum.

Interestingly,  here the "nazar" has been gendered -- one version  on the hospital-door turned pink.