>...detection and sorting by color filtering was doable in 1998... I did a project with Lego sorting marbles in 2009 doing this in High School. By that point,

>...detection and sorting by color filtering was doable in 1998... I did a project with Lego sorting marbles in 2009 doing this in High School. By that point, anyone with $100 and a few hours of spare time could put together a rudimentary sorting system.