The chart on the inside is someone's natal chart, is it not?
Neither chart has a grand cross. But the natal chart has a square between Neptune and Saturn. The transit chart, on the outside, has a square between Neptune and Sun. Transiting Neptune is square natal Neptune and opposite natal Saturn, turning that aspect into a t-square by transit. Transiting Sun fills in the fourth spot, being square t-Neptune and n-Saturn and in opposition to n-Neptune. So, it's a grand cross by transit.