A caveman is a person who lives in the past, who is not as advanced as people today. They are usually very conservative and they believe in traditional values.
The word preposterous means absurd, impossible. When you say something is preposterous, you are saying that it is impossible for that to be the case.
When something sparks is when it starts to work or when it starts to produce an effect. When you light a match, the spark starts to produce heat.
A momentous event is something that is very important. It might be something that you were hoping to happen, or something that you were afraid would happen.
A harpsichord is a type of keyboard that is used to play the harpsichord. It is a very old instrument, and it is usually played by a musician.
A harpsichord is a musical instrument that is usually played by a person. It is a type of keyboard instrument, and it has a lot of strings that are played with a keyboard.
To thinkable is to be possible or conceivable. When you say that something is thinkable, you mean that it's possible to think about it and deal with it.
To play with something is to enjoy it, to have fun with it. Children often play with toys, and adults sometimes play with hobbies or other interests.
Workspaces are places where people work. They can be in offices, at home, or anywhere else.