Shake, slide, spin, pop, store â repeat! The interactive design of My First Activity Cube introduces babies and toddlers to shapes, sorting, and sounds that delight. Brightly colored letters â A, B, C, and D - fit into the cutouts on one side and shapes â heart, circle, square, and triangle - fit into the cutouts on another side. Rotating gears spin and a moon, triangle and diamond climb up and down on other sides. On the fifth side shake up the pellets inside a clear window to stir up curiosity and chuckles. Your little one will love to give this activity cube a spin and when theyâre done the cutouts store neatly inside the cube.