Don't Need 'Em All

Riddle: How many 1 foot by 1 foot bricks would it take to complete a building that's 20 feet long on all four sides and 20 feet high?

Answer: Only one; the last brick you put in will complete it.

Source: https://www.riddles.com/97

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Riddle: How many 1 foot by 1 foot bricks would it take to complete a building that's 20 feet long on all four sides and 20 feet high? Answer: Only one; the last brick you put in will complete it. — Riddle Meme with riddle and answer link.

Riddle: How many 1 foot by 1 foot bricks would it take to complete a building that's 20 feet long on all four sides and 20 feet high? Answer: Only one; the last brick you put in will complete it. — Square Riddle Meme.