I think it has to do with partly with contrast so that its easier to find the pieces in a bag rather that one of all one color, but also it makes the build more 'entertaining' to build, where as a single color for all internal structures could get boring.
3:08 Why do they have all of those weird colours in the base of a lot of Lego builds?
I think it has to do with partly with contrast so that its easier to find the pieces in a bag rather that one of all one color, but also it makes the build more 'entertaining' to build, where as a single color for all internal structures could get boring.