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Many-fingered time
The Khronos Projector lets you time-shift parts of a video image by poking it.
I like the very carefully worded statements on the site about relativity, which make me think that these people also know their physics. The ArsTechnica post that pointed me to it suggested that it "shows space-time as deformable", but what it actually engages more directly is the notion of the arbitrariness of embedding of "equal-time" surfaces in space-time, a constant stumbling block in talking about black holes and cosmology. Messing with this thing might be useful as an intuition-builder in that regard.
I like the very carefully worded statements on the site about relativity, which make me think that these people also know their physics. The ArsTechnica post that pointed me to it suggested that it "shows space-time as deformable", but what it actually engages more directly is the notion of the arbitrariness of embedding of "equal-time" surfaces in space-time, a constant stumbling block in talking about black holes and cosmology. Messing with this thing might be useful as an intuition-builder in that regard.