The fourth dimension

162 THE FOURTH DIMENSION

colours white, yellow, red, blue, to denote transferences in

each of the four directions—right, away, up, unknown or fourth dimension.

Hence, as the plane being must represent the solid re-

gions, he weuld come to hy going right, as four squares lying

in some position in

his plane, arbitrarily

chosen, side by side with his original four squares, so we must represent those eight

four-dimensional re-

gions, which we

Fig. 99, should come to by

A plane being’s representation of a block going in the fourth

of eight cubes by two sets of four squares. dimension from each

of our eight cubes, by eight cubes placed in some arbitrary position relative to our first eight cubes.

(1) (2) Orange hidden Brown hidden

Fig. 100,

Our representation of a block of sixteen tesseracts by two blocks of eight cubes.* Hence, of the two sets of eight cubes, each one will serve

* The eight cubes used here in 2 can be found in the second of the model blocks. They can be taken out and used,

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