The Constructive Playthings Translucent Color Building Blocks and Light Table encourage kids to discover endless possibilities and have fun while learning. The translucent plastic shapes are see-through and can be paired with the light table to explore light, reflection, and color. Arranging and stacking the colored cellophane on the table creates color mixing, helping children discover new colors and how they work. Toddlers and kids ages 3 and up will enjoy grouping, counting, making patterns, and sequencing these blocks for early STEM knowledge and improved motor skills. The 50-piece set of shapes comes in 5 sizes and 6 different colors, including red, orange, yellow, green, blue, and purple for the complete rainbow spectrum. The circular pieces, rectangular pillars, triangular prisms, cubes, and bridges come in a convenient storage container that measures 11.7" x 7.15" x 5.7" for on-the-go play and easy cleanup. For more than 60 years, we have been committed to providing educational products and toys that inspire learning, creativity, and fun for children. Each product is thoughtfully designed and constructed to meet or exceed Federal requirements as well as the high standards Constructive Playthings was founded on.