People still flip out when they learn they can check out a pigeon at the Museum of Contemporary Art Denver — and we don't mean that they can just see one; we mean they can check one out like a library book, then take it home — with the stipulation that they then let it loose. These birds, part of an ongoing project called Thinking About Flying by artist Jon Rubin, are trained homing pigeons, which makes them way more convenient than a book. We had our own fun with the project when Westword writer Jef Otte raced a checked-out pigeon to MCA on his bike (the pigeon, it turned out, took her own sweet time), but you can also find documentation of other pigeon experiences on MCA's website. Or just try it on your own, though time's running out: Thinking About Flying packs up and flies away after April 30.