For those of you wondering if Benjamin gets enough attention, here's your answer:
We only left him alone for a minute while we went to investigate this:
And he promptly did this:
Which is weird a) because tummy time usually only lasts until he decides to flip onto his back (usually less than two minutes), which he's been doing consistently for a whole month now, and b) because I can't ever get him to go to sleep unless I'm nursing him or at least holding him.
In short, he gets plenty of attention. Probably too much.