Technique: Simple Folds - Mountain and Valley Folds Description: Folding a paper with a single crease using edges, corners, or previous folds as guides. Each fold may be more than one layer as long as the folds in each layer share the same line. The first fold is to fold a paper in half vertically, horizontally, or diagonally. Examples: " Cicada " Cup " Samurai Hat " Paper Airplanes " Simple animal heads Bases created: " Book " Diaper " Cupboard " Kite " Diamond " Blintz " Split quarter " thirds, fifths, etc. " 1/3 angle, 1/5 angle, etc.