The engineer's computation pad is one of the quietest icons of working drafting culture: a pale "eye-ease" green sheet with a 5×5 grid printed on the reverse so it reads as a soft show-through rather than a hard line. For forty years it carried hand calculations, sketches, and title-block notes.

This system rebuilds that pad as an interface. Everything sits on the tinted green stock, lettering stays monospace and engineered, and the grid lives underfoot as a faint ruled ground — never decoration, always reference.