The Electronics layer is most accessible. You begin detangling obsolete cables. As you dig, you realize where all the RadioShacks went. You unearth a stray motherboard, soldering kit, six different adaptors, and a sack of servos.
You find a box labeled "Magic 8 Bob" -- your attempt at a fortune-telling robot. The head, anyway. You used the body as a coat rack. Beneath that is "Crystal Math," your talking calculator prototype, meaning Truxby, the unholy Teddy Ruxpin/Furby mashup, must be near.