Plan Toys. Notify me when this product is available: Add me to the store mailing list. Admire these transparent and colourful water and wood blocks by Plan Toys and let your child build colourful constructions! Parents and children alike will appreciate this attractive toy. Beautiful square and semi-circle stacking wooden blocks with sealed coloured water units - put one colour in front of another to get a new colour! This is a wonderfully tactile and original toy.