Wall is part of Cave. you are likely to find Wall in/at/on Room. 
Morning is related to Sunlight. Sunlight can be Bright. Bright is related to Quality. Quality is related to Wall. 
Cave <--PartOf-- Wall --AtLocation--> Room 
Morning <--RelatedTo--> Sunlight --HasProperty--> Bright <--RelatedTo--> Quality <--RelatedTo--> Wall 