from Things To See In Springtime
Take two boards, cards or papers, each about half a foot square; divide them with black lines into 25 squares each, i. e. 5 each way; get 6 nuts and 4 pebbles, or 6 pennies and 4 beans; or any other set of two things differing in size and shape.
Let the one to be tested turn his back, while the Guide places 3 nuts and 2 pebbles on one of the boards, in any pattern he pleases, except that there must be only one on a square.
Now, let the player see them for 5 seconds by the watch; then cover it up.
From memory, the player must place the other 3 nuts and 2 pebbles on the other board, in exactly the same pattern. Counting one for every one that was right. Note that a piece exactly on the line does not count; but one chiefly in a square is reckoned to be in that square.
Do this 4 times. Then multiply the total result by 5. This gives his quicksight number, to be added to his aliveness score.