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This is a screenshot of one of my homescreens, on it are two alarm widgets. Right now, one of them is set to go off, the other isn't. The visual feedback of the green alarm symbol shows which alarm is active. When a user presses the symbol it will turn on or off and light up accordingly, quickly showing the user that their action was registered by the phone.
"Understanding is a fountain of life to the one who has it, but stubborn fools punish themselves with their stupidity." - Proverbs 16:22
US Vice President Joe Biden wipes away tears as he walks past President Barack Obama after he was awarded the Presidential Medal of Freedom during a tribute to Biden at the White House in Washington, DC, on January 12, 2017. / AFP / NICHOLAS KAMM (Photo credit should read NICHOLAS KAMM/AFP/Getty Images)