Visual is related to Illusion. Illusion is the opposite of Real. 
Direct is a type of Order. Order is related to Structure. Structure is related to Cell. Cell is related to Basis. 
Visual <--RelatedTo--> Illusion <--Antonym--> Real 
Direct --IsA--> Order <--RelatedTo--> Structure <--RelatedTo--> Cell <--RelatedTo--> Basis 