It is a line drawing made out of aluminum wire that looks like a wavy net floating in mid-air.

VOA: special.2009.05.06

You have a block here and then you have something above there floating in mid air.

你在这里放一个木块,让某物漂浮在木块之上

耶鲁公开课 - 心理学导论课程节选

Like a flower floating on water, she drifted through the air.

VOA: special.2009.07.25

So he left the camera floating in the air.

VOA: special.2009.06.17