The 4 random circles with numbers on them

What are ?
(T4CN for short) are a set of 4 big circles in a square shape. They are labeled with numbers 1-4 and rest in a white lattice that is known as background. They also sometimes spawn an outline the goes out around 6x the size of the circle.

Activities
There are some activities in T4CN (like the outline circles) that happen around once every 0.4 OYC.

The outline
The outline of a circle appears when viewed ~1 OYC in the past to right before present time. But this only works for ~0.6 OYC periods, with it not working for ~0.4 OYC after. The cycle stops because the outline removes the circle for ~0.4 OYC before it reappears again.