the color blindness tests are rather pleasant to look at. http://cdn2.doutissima.com.br/content/uploads/2014/12/teste-de-daltonismo_2.jpg http://cdn2.doutissim

the color blindness tests are rather pleasant to look at. http://cdn2.doutissima.com.br/content/uploads/2014/12/teste-de-daltonismo_2.jpg http://cdn2.doutissima.com.br/content/uploads/2014/12/teste-... There's an app called percolate which operated on a similar principle. http://mathematica.stackexchange.com/questions/40334/generating-visually-pleasing-circle-packs http://mathematica.stackexchange.com/questions/40334/generat... and here http://www.percolatorapp.com/ http://www.percolatorapp.com/