Line is related to Slope. Slope is related to Grass. Grass is related to Seed. Seed is related to Bulb. 
Illusion is related to Image. Image is related to Portray. 
Line <--RelatedTo--> Slope <--RelatedTo--> Grass <--RelatedTo--> Seed <--RelatedTo--> Bulb 
Illusion <--RelatedTo--> Image <--RelatedTo--> Portray 