Bath boxes evoking memories and kind of visions?!

Question: Bath boxes evoking memories and kind of visions!?

I think it was Simpsons where I first saw some kind of boxes
for a bath that can evoke memories and some visions!.
What is it!?Www@Answer-Health@Com

Answers:

sensory deprivation chambers or isolation tank!?Www@Answer-Health@Com

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Bath boxes evoking memories and kind of visions?!

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