Final answer:
The answer to this riddle is 'a hole'.
Step-by-step explanation:
The subject of this question is a riddle. Riddles are a form of word play or puzzle that require creative thinking to solve. In this particular riddle, the answer is 'a hole'. It is described as tall as a house, round as a cup, and all the king's horses can't draw it up. This riddle uses metaphoric language to trick the reader into thinking about tangible objects when the answer is actually something intangible like a hole.