Nature is related to Leaf. Leaf is related to Bit. Scale is a type of Bit. Scale is related to Pound. 
Pen is related to Poet. Poet is related to Writing. 
Nature <--RelatedTo--> Leaf <--RelatedTo--> Bit <--IsA-- Scale <--RelatedTo--> Pound 
Pen <--RelatedTo--> Poet <--RelatedTo--> Writing 