• For those of us too young to have understood the impact of the fall of the Berlin Wall, and to those who watched breathlessly as the it came down, this should interest you: an augmented reality app that projects a 3-D rendering of the Berlin Wall at its former site with the help of a smartphone.

• It was as big as a . . . The US Intelligence Advanced Research Projects Activity is building a giant repository of metaphors. Yes, you heard me correctly [via Marvin Heiferman, SIA].

• The British Library’s new app brings over a thousand beautiful and rare books in their high-res glory to your iPad.

• You can now read them in their entirety. The National Archives, along with the Kennedy, Johnson, and Nixon Presidential libraries have released the infamous “Pentagon Papers,” parts of which were leaked in the 1970s by a disillusioned former government official and fueled anti-war sentiment at the time.

• Whoa. Now you can search Google Images with images rather than with words. As Marvin noted, "it's like the visual equivalent of free association" [via Marvin Heiferman, SIA].

• “How do you preserve a fleeting, ephemeral art form like dance?” Apparently, there are many solutions, including wiring up dancers and digitizing their movements with avatars!

• Over at the Smithsonian Collections Blog, and in honor of summer blockbusters dealing with related subject matter, a primer on the technological origins of amateur film, from 16mm to the Super 8.

• Speaking of obsolete technologies, check out this video, which tells you how to dial your phone (!?!), straight from the AT&T archives [via Neatorama]:

“AT&T Archives: Now You Can Dial,” 1954, Produced by Charles E. Skinner Productions, Footage courtesy of AT&T Archives and History Center, Warren, NJ and the ATTTechChannel.