Depth information in single triangles and arrays of triangles

Abstract

When 6 obtuse triangles varying, in angular height from 75° to 10° were presented singly at 6 different slants, slant judgments were at chance level. When the view of an array of triangles was varied from 82° to 40° to 22° for the same 6 slants, the accuracy of slant judgments correspondingly varied. It was concluded that arrays of triangles carry information about their spatial orientation even though the individual elements of the array do not.