To continue reading up to 10 premium articles, you must register , or sign up and take advantage of this exclusive offer: Fisher-Price’s Think & Learn Code-a-Pillar introduces basic coding concepts by letting preschoolers assemble segments that tell the caterpillar to do different things. Toys that teach aren’t a new thing, but a growing number are calling for kids to build with blocks, circuits or everyday items before reaching for a tablet screen.