Walking on the clouds, suspended in thin air

from Drake (Ft. DJ Khaled, Lil Wayne & Rick Ross) – I'm On One Lyrics on Rap Genius

Meaning

That purple flower he is burning has him really high..

This line is also a metaphor for being fly. Since he’s above other rapper (metaphorically, and in this case literally), they see the bottoms of his shoes (thus the next line)

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