building blocks

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Across
  1. 3. In architecture, it is a round window
  2. 5. One of the three canonical orders
  3. 7. Ampere founder of "amperes"
Down
  1. 1. Another name for the x-axis
  2. 2. One of the three canonical orders
  3. 3. The art of folding paper into shapes
  4. 4. The father of geometry
  5. 6. One of the three canonical orders