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네덜란드 작가 디오니스 버거가 1965년에 쓴 소설 <스피어랜드>를 바탕으로 한 같은 이름의 애니메이션에는 2차원 생명체인 헥스와 펑토가 3차원과 4차원으로 여행을 떠나는 내용이 나온다. 이 애니메이션의 마지막 장면에는 도넛 모양인 토러스가 나온다. 토러스는 차원과 어떤 관계일까? 탐구하기 문제는 답안을 보지 말고 먼저 풀어 본 뒤 첨부 파일의 모범답안과 비교해 보자.

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