Fixie mod or ninja trainer?

This would be 10x better uncaptioned.

Image caption from an interview with the frame builder for the original photo:

White Industries custom six-bolt crank for integrated bottom bracket disc brake- built when track bike riders were being ticketed for riding on the street without a brake.

Well, it's both isn't it?

Useful as a fixie mod but also doubles for leg day (I hope the modulation is delicate)

Rock Lee's bicycle

You wear shark fins on your teeth and call them shark's teeth; I wear shark's teeth on my teeth. We are not the same.