Possible is related to Realistic. Realistic is similar to Living. Living is related to Lamp. Lamp is related to Slam. 
Skull is related to Ear. Ear is related to Feature. 
Possible <--RelatedTo--> Realistic <--SimilarTo--> Living <--RelatedTo--> Lamp <--RelatedTo--> Slam 
Skull <--RelatedTo--> Ear <--RelatedTo--> Feature 