Had when i worked in a preschool and kids love them! I would use colored sand instead of white salt. DIY salt tray with alphabet cards. Easy to make and kids have fun smoothing out the salt after correctly making the letter
sensory balloon with matching cards. great for teaching 5 senses to preschoolers or keeping toddler hands busy! Except make balloons all one color, or else they'd memorize the color rather than rely on senses to determine contents.
Discovery bottle - Fill to the very top with one part baby oil and one part water (with a few drops of green and blue food coloring mixed in). Shaking will produce gorgeous clear bubbles immersed in t(Bottle Green Room)