Marbotic is an awesome product that gives kids interesting ways to interact with smart devices while learning numbers and letters! They call it tech toys with a soul and they are absolutely right. Each piece is made of wood and has special contact points on the back to let the smart device know what shape it is. Through the companion apps, kids are taught the shapes, sounds and uses of letters and numbers. Very innovative, very well applied, and perfect for your litlgeeks. Kits start at $39.99 and these are also great for schools and teachers, those larger packs are a little more, and you can pick up everything at Marbotic.com.