The cake of soap
In a bath tub with size
full of soapy water and foam, I lost my cake of soap which lays somewhere in the bottom. By dipping my hand, I may touch it, sometimes...
But it is really vicious !
If I don't hit exactly in the midpoint, it escapes in the opposite direction, at an unknown distance, even bouncing on the sides of the tub.
The cake of soap is considered to be a 3×3 square, and it moves at most
The place where the soap was when I touched it is shown, but where is it now ??
The last squares where I dipped my hand are free of foam, but this doesn't allow to see the bottom,
nor the the soap !
Good luck !