The planned, funded ELI –Ultra High Field Facility, which will study light at the intensity frontier, is likely to remain well below the Schwinger limit although it may still be possible to observe some nonlinear optical effects. The Station of Extreme Light (SEL) is another laser facility under construction which should be powerful enough to observe the effect. Such an experiment, in which ultra-intense light causes pair production, has been described in the popular media as creating a " hernia " in spacetime.