Water Blocks

These wooden Water Blocks ($40) provide more than just traditional stacking fun. The acrylic window in each one is partially filled with mesmerizing colored water, with enough air space for shaking, sloshing, and making waves. With each of the primary colors represented, kids can experiment with overlaying the blocks to form secondary colors by peering through two or more windows simultaneously. Made entirely from nontoxic, sustainable materials, these blocks are also extremely durable, so banish those visions of red and blue splotches on your carpet.