Linda Syddick Napaltjarri,  Spirits and Sand Hills,  2006,  acrylic on linen,  91 x 91 cm., Coo-ee Aboriginal Art Gallery.  &quot;The three spirits depicted here are those of three brothers who passed away in the Gibson Desert, long before the Pintupi people left it to reside in missions and out stations. And even today, among the trees is where spirits can be seen by Aboriginal people, always at night time. They look like cotton wool, and can only be seen by Aboriginal people: others see…