It's no surprise. Babies love them.
Based on research, babies respond best to high contrasts, engaging textures, and curious sounds.
Tactile: Woven canvas, slippery satin, ridged corduroy, lush fleece
Visual: High impact black outlines on white; brilliant primary colors
Auditory: Pyramid rings, Ball crinkles, Cube rattles
Beyond initial sensory play, children learn a lot from Mind-Shapes. An introduction to naming objects, color names, basic shapes, patterns, and first attempts to throw a ball come into play.
Meaningful first play comes from sensory stimulation in simple formats. Give one to a baby and they start studying.