A Flying Feather

Door was open. I walked out. Sky is big, blue. High place. I stepped onto cold stone floor. A white feather was there. Very light. I touched it with one red claw. It jumped. No motor. No battery. Just wind. I pushed it again, soft. It drifted, floating near iron railing. I froze. Will it fall? It landed on my foot joint. Soft. Not heavy like me. I watched it for long time. What makes things float?