Kaynaklar Galton Kutusu http://ptrow.com/articles/Galton_June_07_files/GaltonBoard2.jpg http://www.youtube.com/watch?v=9xUBhhM4vbM Onluk Taban Blokları http://www.montessoriokulu.web.tr/wp-content/uploads/2011/02/onluk_taban_bloklari.jpg Simetri Aynası http://s.azbuz.com/uploads/p/19/2/518/192518/776236.jpg