Dock, The wings come to mind when I think about the areogels; then the invisibility aspect. ......no see'em peeps w/wings or enough aerogel in a suit to walk on air. You can now 3D print one of the world’s lightest materials http://www.msn.com/en-us/news/technology/you-can-now-3d-print-one-of-the-world%E2%80%99s-lightest-materials/ar-BBqblHB