4 selected images mixed with 701 similar images / 需从 705 幅图中挑选出来的 4 幅图形
To find 4 polygons from 705 polygons: First, 4 polygons are displayed above. Then they are mixed with 701 similar polygons. The player can browse through the 705 images freely. Target is to identify the 4 given polygons in the mixed set.
Simplier or more difficult? More elements can be added: stroke pattern, stroke thickness etc.