2 examples of well executed and creative pieces of conceptual artwork

1) Golden Arches logo typically symbolize capitalism and globalization for McDonald's, one of the most successful franchises in the world. While the current situation in Iran may have changed the effectiveness of this piece, the purpose was to show how any two countries that had a McDonald's location in between their borders have had no war. Everyone loves McDonalds right?! 

2) Bits & Pieces by Lawrence Weiner is a great example of creative concept. He is using typography to create a piece with a meaning that is expressed via the sum of all the parts. His famous pieces from the 1960's helped shape what we know as conceptual art today.