Chevron

The Concise Oxford Dictionary is today's book for flash of red.

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1 a badge in a V shape on the sleeve of a uniform indicating rank or length of service.
2 Heraldry and Architecture a bent bar of an inverted V shape
3 any V-shaped line or stripe

[Casablanca]

I like this a lot!

[Humphrey Hippo]

I really like the curve of the page edge against the hard lines of the cover.

[amyK]

Reminds me of an optical illusion photo...sometimes I see the book corner, sometimes I see a one dimensional V. Very creative.

[haskar]

Great composition and processing. Lovely abstract.

[SergeantPepper]

Nice tones...

[Lynn]

@walrus thank you!