Shadow is related to Cast. Cast is a type of Gathering. 
Mood can be Dark. Dark is a different concept from Bright. Bright is related to Silver. Silver is related to Olympic. 
Shadow <--RelatedTo--> Cast --IsA--> Gathering 
Mood --HasProperty--> Dark <--DistinctFrom--> Bright <--RelatedTo--> Silver <--RelatedTo--> Olympic 