Learning Resources Spike the Fine Motor Hedgehog Sensory Tree House. There are 5 different textured Spike the Fine Motor Hedgehog toys in this fun set. When children play with the cute colourful hedgehogs, they learn early colour and number recognition skills. Each hedgehog features a different number and colour, and each ones textured back adds a tactile aspect to play. Children can use the treehouse for imaginative play, and the hedgehogs store inside when playtime is done. Includes multilingual packaging and Activity Guide. Tree house base measures 11cm H x 11.5cm L. 7 Piece Set.