There was an old test-tape, one that could almost be thought of as a test of test-tape, though that approached disturbingly recursive, so Grant put the thought aside, into the place he put paradoxes and other such things, not to lose or forget them, but let them just … be, available but not intrusive. Anyway, this test-tape, straightforward skill, manual dexterity, not unlike a penmanship or calligraphy tape, involved folding paper into intricate shapes. Hands learned to fold, crease, turn, this way and that, and viola! A bird, a box, a platythere. Or, not. That was the test, perception, deceptively simple.