價格：免費
檔案大小：634.9 KB
版本需求：需要 iOS 7.1 或以上版本。與 iPhone、iPad 及 iPod touch 相容。
This app performs an optical illusion. Stare at the black dot in the center and the gap in the dots in will fade to the complimentary color.
Change the color of the dot, number of dots, and timing. Show and hide the controls for concentration.
支援平台：iPhone, iPad