Greenwood Space Travel Supply Co. Infinite Lettering

The Greenwood Space Travel Supply Co. asked me to create some lettering for a shirt. I created it in two arcs to enclose the background illustration (by 19th century illustrator Jean Ignace Isidore Gérard Grandville). I discovered that when the two pieces are put side by side, they form an infinite wave of lettering!

Deepest apologies if the GIF takes forever to load, it's 8 seconds long!