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Yes, in the end a cutting edge is a triangle, no matter how you slice it.

But, there is a difference between a knife edge and a chisel, is there not? To me, a western style razor is equivalent to...

http://straightrazorpalace.com/attachments/show-tell/16435d1224435220-my-japanese-haul-other-things-shop-sold-tosuke-tip.jpg

Pic of the tip of a Tosuke.

Kanji side is to the right.

Just...