A library is rarely ever just a library, often evolving alongside the community it serves. The Lacuna Project is taking this idea literally by building a library made entirely of books for this year’s Bay Area Book Festival. Festival-goers will be able to remove (and keep) books without damaging the structure, whose lighting and acoustics will change in response to their collective impact. Pitch in by donating to Lacuna’s Kickstarter or helping sort books for the installation.