From highly-conceptualized thought diagrams of the digital age to the lost collection of a photography legend, this week's art round up spans generations. Check out Dennis Hopper's rarest photos of the 1960s at the Gagosian Gallery or view pieces dating back to the 19th century at the AIPAD Photography Show at the Park Avenue Armory. Then zoom ahead to the future where tweet-length texts complement the complex geometric charts of Andrew Kuo in You Say Tomato—you won't look at 140 characters the same again.