I assumed it was using optical emitter and sensor pairs
It's just a concept right? as in, it's never actually been created in real life?
I assumed it was using optical emitter and sensor pairs that count up the passing of the pencil point
Please enter a valid email to subscribe
We need to confirm your email address.
To complete the subscription, please click the link in the
email we just sent you.
Thank you for subscribing!
via Egeo 16