What the f…

I’d be most grateful if someone could explain to me how this works (btw, you need to move the cursor away from the object once you’ve clicked to get a reaction). Most especially I would like to know why it only works when you come up with the number in the specified way.

Confuzzled.

Voice in my head: Nick Cave and Shane McGowan “What a wonderful world” – Is it just me or is the idea of this pair walking round the park and saying pleasantly to each other “Isn’t the world wonderful?” somewhat surreal?