4 ms·
Looks like there are a series of holes with light sensors at the bottom. The first page exposes 1 hole, the second page 2, etc.
by opwieurposiu 5y ago
Looks like there are a series of holes with light sensors at the bottom. The first page exposes 1 hole, the second page 2, etc.
- amelius 5y agoI didn't see that at first! This might be an issue with the child inadvertently covering the holes. On the other hand, it might open up new avenues of research ...