Why are there so many shape cards in the Nouns 2

Colored Shape Cards in Nouns 2 are for sorting

The set includes 154 colored shape cards. There are multiple colors of each shape, so they can be used for sorting, categorizing, and identification based on feature. This includes the shapes Square, Circle, Triangle, Star, Heart, Rectangle. Octagon, Arrow, Moon, Oval, Hexagon, Diamond, Pentagon, and Trapezoid, each in the colors Red, Orange, Yellow, Green, Blue, Purple, Black, Brown, Pink, White and Grey.
 
See the product description on our website here
 
And, here is a link to one of our Language Builder ARIS lessons describing how these cards are generally used.