HD Wallpaper: 3D. Energy. Spheres. Newton's Cradle
The Newton's Cradle is in this 3D image created by Chris Potter and available from his courtesy under CC By license. Download if you like and wish to use as desktop background, homescreen phone or in other projects that you might have, just apply the CC By license.
Widescreen Desktop / Macbook (Retina): 2880x1800 (fits on: 2560x1600, 1920x1200, 1440x900)
Samsung Galaxy Tab & iPad: 2048x1536 (compatible with almost all tablets)
HTC, Samsung Galaxy & iPhone: 1080x1920 (compatible with many smartphones)