Grue ($G_t(x)$)

For a fixed cutoff $t$, let $E_t(x)$ mean examined before $t$. Nelson Goodman's predicate is $G_t(x)⟺(E_t(x)\wedge \mathrm{green}(x))\vee (\neg E_t(x)\wedge \mathrm{blue}(x))$. An already examined green object remains grue after $t$ without a colour change. The conflicting projection concerns objects not examined before $t$.