¿Qué idea tienes, qué estilo te gusta para tu t-shirt?
The shirt design is aimed at people who enjoy indoor rock climbing. I would like a anime/cartoon style big robot (think transformers) built out of climbing gym volumes (see references), in a superhero type stance. I think a bulkier robot would work best. It could have weapons if they fit the theme, like a impact driver or brush stick (see references). Lettering that suits the drawing style will go above or below that says "VOLUMTRON". Climbing holds could be added to the volumes to give extra shape as you see fit. Color is open.
In the indoor climbing world workers called routesetters build the climbs for the gym customers. They do this with plastic screw on/bolt on holds and what is essentially wooden boxes called volumes. These can be big or small and change the landscape and angles of the wall. here are some references.
A climbing route with volumes: https://twitter.com/ssclimbing/stat…1250869249
You can see here all the black triangle features attached to the wall.