there's many thing we never see in this world. like a flying cat . a floating rock . any human lives in the water . a alien . its a metaphor for someone who got problem actually, for example. i got problem at choosing where to go and continue my life. 'damn its like a floating rock!!' that's the fact! the life with not turn well like we planned. that's why we figure out the problem order to move on. but some problem we cant solve. we need to play along to make the problem one of our routine .thats all.