vsauce spongebob here / where is your gay awareness symbol
A Imagination meme.
Imagination is SpongeBob forming a rainbow with his hands, from the episode where he explains imagination to an unimpressed Squidward. Captions start with "Imagine a world..." or simply "Imagination", and end with a dream, a fantasy or something nobody cares about. It's the meme for wishful thinking and sarcastic enthusiasm.