A display sheet/board - items with different textures, smells, sounds i.e. bells, pictures of items made to smell (an orange sprayed with orange scent), different fabrics/materials. Create a theme and you could take items along to taste to follow that theme. I can't really see how you can do it without involving tasting in there somewhere, but at least that way you are incorporating different ideas rather than just taking foods etc.
HTH.
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