Hi Yvan - come to think of it, I talked to the person with the plant on brick - he said it had not attached, either. Perhaps in the wild this would just grow on top of wherever it landed, and pieces break off to grow elsewhere.
South Louisiana, so everything gets pretty bright light; though I keep this hanging amongst bigger things, so it's not roasted. I would call it dappled bright. I agree, the form of the plant is really appealing.
Regards - Nancy