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Constructing a corner cube or retroreflector instead of the
conventional wall would allow solo practitioners of the sport to
get their exercise.
A single large retroreflector would return the ball at the same
angle at which it was thrown, but at varying distances
depending on how close to
the vertices of the reflector.
Alternatively, a wall tiled with suitably sized reflectors should
work to return the ball arbitrarily close to the pitched
location, with the occasional whacky return when the ball
happened to hit an external joint.
For reference [csea, Sep 02 2014]
||I like the idea, but wouldn't the individual corner
cubes have to be very big, to reduce the proportion
of times on which the ball hit an edge?
||There would be a balance between distance
between serve and return (greater with larger
geometry) and proportion of edge returns.