PRESS HERE, MIX IT UP!, LET'S PLAY! AND NOW SAY ZOOP! COLLECT ALL FOUR INTERACTIVE BOOKS FROM HERVE TULLET!ACCEPT HERV? TULLET'S IRRESISTIBLE INVITATION TO MIX IT UP IN A DAZZLING ADVENTURE OF WHIMSY AND WONDER. FOLLOW THE ARTIST'S SIMPLE INSTRUCTIONS, AND SUDDENLY COLORS...