Lebogang reached over and switched off his tablet. The ghost in the circuit vanished.

“You know,” Mr. Nkosi said, “in real technology, the best tools are the ones no one notices. The ones that just… help.”

The LED flickered. A ghostly 3D triangle and square appeared on the page. The square wobbled and collapsed. The triangle stood firm.

Lebogang activated the device from his pocket, aiming it at the pile of papers on the invigilator’s desk. A silent infrared grid washed over the first page. One by one, as students turned to a diagram-heavy question, the little animations bloomed—just faint enough to look like a trick of the light, just helpful enough to unlock a stuck thought.

Thandi stared at the circuit diagram. A tiny blue electron winked to life, moving from negative to positive. She smiled. Her pencil flew.

He worked until 3 a.m., sweating over the code. When the tablet detected certain keywords from the exam paper’s scanned QR code (which his father had left on the corner of the desk), it would project, via a weak infrared beam, a simplified hologram into the margin of the paper. Not the answer—just a small animation: a gear turning to show direction, a triangle bracing a beam, or a smiling electron running the correct way along a wire.

That’s not technology , Lebogang thought. Technology is supposed to make things clearer, not scarier.

“Don’t even think about it,” his father said without looking up, tightening a bolt on a model bridge. “These stay in my briefcase until Monday.”

On Sunday night, while his father slept, Lebogang tiptoed back to the study. He didn’t touch the papers. Instead, he powered on his old tablet and opened a simple coding app. Using a scrap of conductive tape and a discarded LED from the lab bin, he built a tiny, battery-powered “Answer Clarifier.”