The world changed a lot for Left, after Right disappeared. It got more work to do, more weight to carry, more keys to press. The first two weeks were so tough, Left thought it would never be able to cope. It had to complete complex tasks it never had to try before. It failed at many of them, letting its human down. It could feel his resignation when he let it fall limp after repeatedly dropping the tool.
How it missed Right. Right knew how to do all that and it was stronger and more agile. Right always helped Left with the hard things and shared with it all the nice things, like holding other letfs and rights or scratching the dog and the cat.
But, over time, Left got better at its tasks. It grew stronger and could now carry more weight than ever before, it could open jars and squeeze lemons.
And then, one day, Right was back.
"Oh, Left, it's so good to see you. It's so good to see anyone!"
"Where have you been, Right? Look! Look what I can do!"
"I've been to a dark, dark place, kid. Oh, it hurt so much for a long time. And it was dark and uncomfortable. I coulnd't move at all. I thought I'd never get out. But, here I am, good as new. Well, a bit weak, but that will sort itself out soon enough."
"Right?"
"Yes?"
"I'm so glad you're back."
"Me too, kid, me too."