[tectec]

That's why you have to group similar forms. - Bricks - Plates - Narrow Plates - Wheels - Windows/Doors - Smooth pieces - People bin

And then if you like to sort further you sort out the smallest of each bin because those always fall to the bottom when mixed together

[em-bee]

sorting by size needs to come first. from my own experience, you can't find any small pieces if they are mixed/covered by larger ones.