What age do children understand magic? This morning I made my 11 month old daughters stuffed giraffe disappear and I swear she was truly surprised and couldn't work out where it had gone. Is she old enough to be amazed by magic, or are we projecting ourselves onto her?
Your question sounds related to object permanence -- the understanding that an object should still be there even when it's out of sight. There's been research and studies into those ages in which babies start showing an understanding of object permanence. According to wikipedia, by the age of 8 to 12 months, babies will start showing the earliest understanding of object permanence.