If writing about music is like dancing about architecture, then what are movies about dancing? They're just plain entertaining, and this year's San Francisco Dance Film Festival has plenty to choose from, including more than three dozen shorts from around the world, and some features having their San Francisco premiere. Shorts to look out for include the meta Outside In, a Swedish film about an ethereal dancer in a foggy forest who gets fed up with the filmmakers; One Man Walking, a high-energy look at krump, hip-hop, and parkour on the mean streets of London; Spiegelingen (Mirroring), about a man exploring a house that proves to be bigger on the inside than the outside (and no, it's not a TARDIS); Momentum, the first-person story of how a humble tortilla led to a journey of self-discovery; and Being Alice: The Making of Alice's Adventures in Wonderland, about the making of the Royal Opera House in London's first ballet with a newly commissioned score since 1991. London is also the source of the Dance Festival's must-see event, Ross MacGibbon's Swan Lake 3D, a you-are-there film version of Matthew Bourne's long-running and much-awarded production of the classic ballet, notable for its use of gothy male swans. It's so mesmerizing, you won't even think about the architecture.