My phrasing may be confusing, but I'm not sure how else to describe it. Is there anything specific that dictates what or how you add to your collection? If so, I would love to hear about it and why! For example, no two dolls in my collection can have the same body in the same resin colour. It needs to either be a different body or a different colour, but ideally both. I want my collection to have a lot of variety or it will feel too monotonous for me. If two dolls have the same body in the same colour, I'd rather have the head share one body - but of course I want to be able to display all of my dolls at once, so I don't want to do that either. Additionally, since I have been a student all this time, one can imagine just how slow-going and limited my activity within the hobby is. For me, having the rule that I made for myself is like a fun game, and it gives me something to do when I'm in school away from my dolls. I can space out or spend hours on different websites just planning for different dolls and what colours they'd be, what bodies I could hybrid, and what I could do with their customization. For someone who spends most of their time in the hobby just waiting, this helps to keep me immersed. EDIT: Since it's been mentioned a few times, 'no recasts' is a given! Counterfeits are not a part of the hobby and are therefore not included in the consideration of a collection by nature.