Subject: Why does light reflected from a cylindrical object project a 'heart' shape?

For years, I have noticed that light reflected from a cylindrical object (e.g. 
a metal ring, a mug, a metallic watch rim) projects a double-arch 'heart' 
shape in the middle of the circle. While many websites talk about reflections 
from concave and convex mirrors, I have not yet been able to find one that 
demonstrates what happens when the mirror is a complete circle. How does 
this 'heart' pattern emerge? Can it be predicted / calculated? Thanks!

Re: Why does light reflected from a cylindrical object project a 'heart' shape?