Figure 3. Experimental observation of fish in the aquatic ray cloak.

Dynamic monitoring of a fish swimming through the aquatic ray cloak. The outline of the invisible fish body is indicated by dotted lines. (a) The main fish body inside the cloak is invisible; only the tail outside of the cloak is visible. (b) Only the fish head outside of the cloak is visible. (c) The main body of the fish comes out of the cloak and thus becomes visible. (d) The whole fish has come out of the cloak.