Series 12

01 Puddles and Pools Episode 15th December 1972 02 Spots Episode 212th December 1972 03 Animals Episode 319th December 1972 04 Lines Episode 42nd January 1973 05 Doors Episode 59th January 1973 06 Wheels Episode 616th January 1973 07 Bricks Episode 723rd January 1973 08 Balance Episode 830th January 1973 09 Metal Episode 96th February 1973 10 Weather Episode 1013th February 1973 11 Nets Episode 1120th February 1973 12 Clocks Episode 1227th February 1973 13 Pipes Episode 136th March 1973 14 Uniforms Episode 1413th March 1973 15 Numbers Episode 1520th March 1973 16 Water Episode 1627th March 1973