The font for this test case is again the same Zycon as in GVAR–4. Here, axis T₁ controls the timidity of 🐢 U+1F422 TURTLE. If your implementation is correct, the turtle should fully stick its head, legs and tail out of the shell at T₁ = 0.0. As the axis value goes up, the turtle should become increasingly timid. At T₁ = 1.0, it should be fully hidden inside the shell.