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Re:Decline of play and rise of sensory issues in preschoolers by rurounijones on Wednesday September 09, 2015 @08:56AM (#10191100)
This was a consumer kit aimed at schools. Looks like there were many different types as obitoo has another that I have never seen.

http://gallery.nen.gov.uk/asset78077_1582-.html

Re:Decline of play and rise of sensory issues in preschoolers by 7Z7 on Wednesday September 09, 2015 @11:19AM (#10191956)
Huh! Ours, and the ones I saw on telly as a nipper, did not look like an actual turtle! It was just a smooth hemisphere with gubbins on display, inside.