The phrase "beautiful juxtaposition" means when two things that are very different are placed or seen together in a way that creates a striking, pleasing, or harmonious effect. Full definition
Often lyrically bleak, the band finds the perfect counterbalance with enough bouncy bass lines and jangly guitars to create a beautiful juxtaposition — and one of this year's best offerings. (relevantmagazine.com)
So, set your alarm for 5:30 am in the UK to see a beautiful juxtaposition of a 26 - day - old waning crescent Moon and dazzling planet Venus in the twilight. (astronomynow.com)