Cyanotype prints (the deep-blue photograms invented by Anna Atkins in 1843) usually need a darkroom and citric acid. Sunography cards are pre-coated paper: arrange a leaf, a key, a hand on top, leave in the sun for two minutes, rinse with water — fixed permanent print. Set of 5 cards at the MoMA Design Store; works on any sunny windowsill. Family-friendly gift for someone learning photography from first principles.