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Parallelogram you can build yourself very cheaply, less than $50
The other method using the mirror will be much much more as the mirror needs to be alumanised on the front face of the glass, not the rear like on a bathroom. This cuts out the double reflection caused by the two surfaces of the glass.
One good thing about the mirrored one is that you dont need to move your neck that much. Most people go the parallelogram way because its cheap and can be made simply with backyard tools and can be any design you wish.
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