you are likely to find Sand in/at/on Concrete. Sand is related to Yellow. Yellow is a different concept from Green. Green is related to Red. 
you are likely to find Driveway in/at/on City. City is related to Central. 
Concrete <--AtLocation-- Sand <--RelatedTo--> Yellow <--DistinctFrom--> Green <--RelatedTo--> Red 
Driveway --AtLocation--> City <--RelatedTo--> Central 