Pencil is related to Draw. Draw is related to Crawl. Crawl is related to Infant. 
Invisible is a different concept from Apparent. Apparent is a synonym of Visible. 
Pencil <--RelatedTo--> Draw <--RelatedTo--> Crawl <--RelatedTo--> Infant 
Invisible <--DistinctFrom--> Apparent <--Synonym--> Visible 