The phrase "summer luxury" refers to the delights of summer in the poem "The Poetry of Earth." -A summer luxury is something that you only get to enjoy once every year or so, such as a week at an ocean resort. The word "luxury" here means something that is very nice but not necessary for survival. Earth's joys - sunshine, rain, flowers, trees, water, and stars - are a summer luxury that few people experience more than us humans. Other animals may enjoy these things too, but we humans love them especially when they are around summertime! Luxuries are things that you can only afford once in a while because they require money or time away from other needs. For example, eating out at a fancy restaurant or going shopping without any real need for something new would be considered luxuries. Summer is a time of life when almost everyone wants to go to the beach or take a vacation, so those are good examples of summer luxuries.