City Skyline Glow Blocks are innovative wooden blocks when played under normal light produce one pattern design and another pattern design when viewed in the dark or under low light. Includes 19 wooden block shapes that, when stacked and arranged, resemble both day and night views of a city skyline. Promotes hand-eye coordination, concentration and logical thinking. Eco-Friendly: Made in Thailand from environmentally friendly rubberwood and strictly using Non-Toxic Paints, Dyes and Lacquers and Formaldehyde Free Glue. Packaging is made from at least 70% recycled paper.