Illusion is related to Dream. Dream is related to Mental. Mental is related to Depression. 
Structural is related to Column. Column is related to Strip. Strip is the opposite of Dress. 
Illusion <--RelatedTo--> Dream <--RelatedTo--> Mental <--RelatedTo--> Depression 
Structural <--RelatedTo--> Column <--RelatedTo--> Strip <--Antonym--> Dress 