When is it a collection?

This past weekend I attended an estate sale where I picked up yet ANOTHER cookie jar in the shape of an extant building. This is the Jackson Brewery in the French Quarter of New Orleans.

The workmanship is incredibly detailed and I just thought it was so fascinating and well done I had to have it even though I wasn't familiar with the building (let alone for $5). Ignore the kitchen wall behind which has had the wallpaper peeled from it but hasn't been sanded or painted!

So my question to you is this; now that I have 3 of these cookie jars when does it become a collection?!