When you work in an highly regulated environment like the #spaceindustry it is very important to keep the spirits up despite the documentation grind. At Berlin Space Technologies GmbH we are helping the mood by automating many of the tedious tasks and it is evidently shown by our guys having fun at work.
On a more serious note, the smiley was drawn on the Styrofoam carrier on which the thermal shroud is placed. You can see it because there is a cut-out. So it won’t have any adverse effect on the product. On the plus side it also allows you to gauge when the glue has dried.