https://orcid.org/0000-0003-3290-3207
Figures & data
Figure 1. Hara’s mazes with the pachinko ball and magnets in a plastic box.
Figure 2. Ota’s maze with the Konoe Double and magnets covered with acrylic plate.
Figure 3. Ota’s abacus (the one on the left is the former version, and the one on the right is the latter version).
Figure 4. Hara’s put-stick-in (standard).
Figure 5. Hara’s put-stick-in (dowels putting caps).
Figure 6. Hara’s put-stick-in (thick dowels).
Figure 7. Hara’s put-stick-in (cylindrical base wood and vinyl sticks).
Figure 8. Hara’s put-stick-in (rivets, and magnets embedded at the bottom of the holes).
Figure 9. Hara’s put-stick-in (semicircle).
Figure 10. Hara’s put-stick-in (large-, middle-, and small-sized sticks).
Figure 11. Variety of HMMs (Mizuguchi’s works).
Data availability statement
The data that support the findings of this study are available from the corresponding author, [Y.K.], upon reasonable request.