Theory is the opposite of Practical. Practical is the opposite of Theoretical. Theoretical is related to Ideal. 
Striking is a form of Strike. Striking is a synonym of Dramatic. Dramatic is derived from Drama. Drama is related to Tension. 
Theory <--Antonym--> Practical <--Antonym--> Theoretical <--RelatedTo--> Ideal 
Strike <--FormOf-- Striking <--Synonym--> Dramatic --DerivedFrom--> Drama <--RelatedTo--> Tension 