* They all reach for the sky.
* Skyscrapers literally reach for the sky with their height.
* Ernest Hemingway's writing often focused on themes of courage, facing the unknown, and seeking meaning in a vast and often indifferent world. This could be seen as a metaphorical "reaching for the sky."
* Mark Twain's work often explored themes of human nature, the complexities of society, and the search for truth. This could also be seen as a metaphorical "reaching for the sky" in terms of seeking understanding and knowledge.
Let me know if you'd like to try another riddle!