本研究作一系列的實驗，探討三角基之移動原則。三角基是立體書裡面使圖片產生移動的一種基本結構。實驗的方式是，將不同的三角基黏貼在圖卡中，然後觀察三角基以及黏貼其上的圖片之移動方式，並找出影響移動方式的因素。根據9個實驗的結果，獲得8項三角基的移動原則：1.三角基的移動方式是，以頂角為定點，以三角基中摺線為半徑，作圓弧線的旋轉移動；2.三角基的移動方向是，從頂角往底邊的大方向移動；3. 三角基頂角愈大，移動幅度愈大；頂角愈小，移動幅度愈小；4.三角基的旋轉幅度等於頂角的角度；5.三角基移動時，頂點不動，離開頂點愈遠的點，移動的速度愈快；離開頂點愈近的點，移動速度愈慢；6.三角基的頂角愈大，移動速度愈快；頂角愈小，移動速度愈慢；7. 三角基移動時，基盤上的任何一點一方面逐漸遠離卡片中摺線，同時朝向中央移動；8.卡片展開時，離開頂角愈遠的點，當卡片摺合時，會移到「愈高」（離開卡片中摺線愈遠）的位置；離開頂角愈近的圖片，卡片摺合時，會移到「愈低」（離開卡片中摺線愈近）。

Nine experiments were done to study rules regulating the movement of Triangular Base Structure (TBS) in a mobile picture card. TBS refers to a basic structure causing the movements of pictures in pop-up books. In each experiment, various kinds of TBS were glued to a card, and observations were made to find out how and why TBS moved. Eight rules were found to regulate the movements of TBS, among them were: 1. TBS moved in circular
form around its tip. 2. TBS moved in the direction from tip toward base. 3. TBS moved the span of its tip angle. 4. The larger the tip angle, the greater the span of movement.