But How Do You Steer It?

The Sandbox Threads' shirt shown above features a concept drawing from 1947 of a concept motorcycle.

While my parents were visiting last week, I fulfilled an order for what we call the 47 Bohn Motorcycle. My dad pointed out a design flaw--how exactly do you steer that thing? If you look closely, you really can't. None the less, we think the design looks great on a Sandbox Threads shirt.