with regards to the "walking on air" comment: I imagined the unseen edge of the table facing the viewer straight on. Even in that situation, though, you're right: the feet just barely hang off the edge. I could easily fix it, however, by moving the footprints up a few pixels, which would be the case were this design ever printed.
Might work better with three tube things. I was confused at first and thought they were attached and it was supposed to be some sort of DNA mixup/hybrid breeding thing. Then I remembered Jurassic Park.
http://people.ucsc.edu/~tbabb/shirt_temp/nature-preview-anim-long.gif
(Wait 7 seconds for preview to change).