Make: Volume 86

illuminate when next to each other (Figure

P

).

Set block W aside (no sense wasting your

batteries). Add a second magnet to block X, in

either position on the right side. Tuck in the

switch wires in the top or bottom of the block.

4. Block Y — Slide the block Y sensing switch into

the slot opposite the magnet in block X. Block

Y will now illuminate when next to block X. Set

block X aside.

Slide a magnet into the right side of block Y,

in either position. Tuck in the switch wires

(Figure

Q

).

5. Block Z — Slide the sensing switch from block

Z into the position opposite the magnet in block

Y. Block Z will illuminate its number when next to

block ...