Ground is related to Solid. Rubber is a type of Solid. Rubber is related to Tree. Tree is related to Shadow. 
Laugh is related to Consequence. Response is a type of Consequence. 
Ground <--RelatedTo--> Solid <--IsA-- Rubber <--RelatedTo--> Tree <--RelatedTo--> Shadow 
Laugh <--RelatedTo--> Consequence <--IsA-- Response 