Image credits

by rule number

Thinkstock [www.thinkstock.co.uk]

50, 89, 94, 110, 116, 128, 133, 137, 139, 140, 144, 146, 147, 153, 157, 159, 166, 168, 174, 178, 192, 193, 203, 207, 210, 216, 219, 220, 221, 222, 223, 226, 227, 229, 235, 236, 239, 240, 241, 243, 247, 252, 253, 260, 268, 274, 285, 298, 306, 307, 308, 312, 314, 321, 326, 329, 334, 337, 345, 349, 355, 358, 363

Shutterstock [www.shutterstock.com]

123, 160, 230, 231, 232, 238, 244, 276, 305, 309, 318

Vectorstock [www.vectorstock.com]

5, 92, 99, 143, 258, 280, 316, 362

Fuzzimo [www.fuzzimo.com]

344

Courtesy of Nikon

243, 245

Courtesy of LaCie

277

All other images were created by the authors.