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