I'll be in Naples, Florida for the Jamali fine Art gallery event to answer your questions and possibly talk about spirits and "Spirit Expressionism" with Jamali’s permission.

Here is for example :  What are spirits made of ?  They are made up of energy, a type of energy that is not native to this world.

Do they change their appearance?  There are different types of spirits, the good ones and the bad ones. Most of the time you will be afraid of both kinds if you see one because of their presumed power which some have and some just specilaze in scaring us but other than that have no real power.  We have spirits inside us if we remove the spirit it's appearance if just like us but no physical part. Now this spirit can and does transfer into a more natural state which resembles a spear of energy and it can move back and forth between these two forms. All this is fairly accurately painted by JAMALI.

Does every one have a spirit? I'm not sure because some people's spirit resembles a "snake". I guess they have a snake spirit.

How do you see them? Scientists say there is a chemical in our brain that keeps us form seeing certain things.  I'm not sure.  One way would be to visit the museum or one of Jamali's gallery's.  He also paints a broad base of paintings some of which are hard for me to understand but they bring a good price and sale rather easily.