[dickmc]

You can also use the slower/faster buttons to change speed. Disappearance persists down to surprisingly low speeds. [If there are no buttons on the right, please update your Flash player.]

You can use the larger/smaller buttons to change size. Disappearance persists up to surprisingly large sizes.

You can use the “back-col” button to change the background colour. The yellow dots disappear into whatever colour the background has.

The ‘defaults’ button at the top restores the standard settings.

According to Michael Bach, "Steady fixation favours disappearance, blinks or gaze shifts induce reappearance. All in all reminiscent of the Troxler effect, but stronger and more resistant to residual eye movements."

[wideminded]

Very interesting. I wonder if that effect is related to this.

[newbolt]

Blinking your eyes stops this. Learned early in flight training.

[loungitude]

.

[buffaloguy]

Well known effect in the target shooting community. You have about 20 seconds from the time of target acquisition to shoot. After that, your sight degrades rapidly.