Toys glide to practice concentration, focus and observation

There are many kinds of wooden toys that use the concept of slides. For example Sliding Car (car glides), Sliding Bug (insect glides), Sliding Ball (ball slide), Sliding Puppet (slide doll) or  Sliding Marbles (marbles slide).

In general, the educational toy of this type of work (1) to train the eye velocity, (2) training of concentration, focus and observation, (3) introduce the concept of high-low, slow-speed, (4) contain elements of entertainment.