I’m talking about differently coloured bricks on the inside of a model. That is definitely not some nefarious scheme to make you buy more lego. Nowadays there

I’m talking about differently coloured bricks on the inside of a model. That is definitely not some nefarious scheme to make you buy more lego. Nowadays there are so many custom pieces and people don’t really rebuild much anyway, so they don’t even need to discourage what you describe using colours.