About using different shades of brown together

[Iysk]

When people do this is in their MOC, like housing and stuff, is it simply because it gives that uneven/inconsistent log look?

[badboytje88]

I think this goes for mixing old and new greys too. I for one like to mix the old and the new grey bricks. Especially when you build a big wall. A little bit of different shades in a big wall makes it less plain.

[gcanik]

I think there are two reasons for doing this (using multiple shades of a color), 1.) lack of proper amount of bricks in the same color. 2.) And I think this reason,#2, goes for the more serious/experienced MOCer, using different shades of the same color breaks up the monotononus look of a wall or facade. To see this better, hop in your car and drive around and look at the side of buildings or any structure that is made up of wood or bricks. They are not all exactly the same color but use shades of the same color. It breaks up the color and looks more pleasing visually to the eye. Capturing that detail in LEGO, while not hard in building aspect is complicated by the limited colors available and size of MOCS. But it is something I do try to incorporate into my buildings and facades when necessary.