Series 13
1974 · 32 episodes
Episodes
1. Coils and Springs
January 1, 1974
2. Opposites
January 8, 1974
3. Signs and Signals
January 15, 1974
4. Ghosties and Ghoulies
January 22, 1974
5. Triangles
January 29, 1974 · 25m
6. Waves
February 5, 1974 · 25m
7. Food
February 12, 1974
8. Windows
February 19, 1974
9. Drips and Drops
February 26, 1974 · 25m
10. Humps and Lumps
March 5, 1974 · 25m
11. Air
March 12, 1974
12. Growing
March 19, 1974 · 25m
13. Bags
March 26, 1974
14. Spikes
April 2, 1974 · 25m
15. Episode 15
April 9, 1974
16. Circles
April 16, 1974 · 25m
17. Reflections
December 31, 1974 · 25m
18. Episode 18
January 14, 1975
19. Episode 19
January 21, 1975
20. Episode 20
January 28, 1975
21. Building
February 4, 1975 · 25m
22. Episode 22
February 11, 1975
23. Space
February 18, 1975 · 25m
24. Games
February 25, 1975 · 25m
25. Episode 25
March 4, 1975
26. Episode 26
March 11, 1975
27. Episode 27
March 18, 1975
28. Dark and Light
March 25, 1975 · 25m
29. Litter
April 1, 1975 · 25m
30. Zigzags
April 8, 1975 · 25m
31. Episode 31
April 15, 1975
32. Wood
April 22, 1975 · 25m