Fundamental is a type of Factor. Fundamental is a synonym of Underlying. Underlying is related to Motive. 
Position is related to Rest. Rest is related to Quiet. Quiet is related to Reading. Light can be used for Reading. 
Factor <--IsA-- Fundamental <--Synonym--> Underlying <--RelatedTo--> Motive 
Position <--RelatedTo--> Rest <--RelatedTo--> Quiet <--RelatedTo--> Reading <--UsedFor-- Light 