Its been 24 years since this was uploaded, and I still come back to this. Many years ago, I really liked looking up optical illusions and this was one of the many things I found during that time that really stuck out to me.
Its very simple but cool, and the 2 secrets aren't too hard to find (One of the plain red books in the library leads to another illusion, and in the main hall, move your mouse over the left edge of the small shelf the red book is on; when the candles to the right light up, click the shelf edge to find the illusions from vol. 1). The music in the main hall is catchy too.
Anyway, this brings back lots of memories. You made something cool dude. You might not see this, but thanks for making this. It kept me entertained back then when I was bored, and still does today.