The Simgram™ images on our gallery page are small (6 kByte) previews of QuickTime VR "object movies". You can interact with these Simgram images, moving up/down and left/right, but each QTVR file is over ten times larger than each of our animated GIFs. Each of the full-size files will load into its own window when you click the link below its preview.
To load and then interact with these images you will need QuickTime VR, which should install and run itself automatically. If that fails, download it free from Apple's QuickTime site (you don't need iTunes or the "Pro" version).
All the other movies are animated GIFs.