Answer:
If the Word of God is the Truth it says it is, then visions do occur.
"...Hear now My words: If there be a prophet among you, I the Lord will make myself known unto him in a vision, and will speak unto him in a dream. My servant Moses is not so, who is faithful in all Mine house. With him will I speak mouth to mouth, even apparently, and not in dark speeches; and in the similitude of the Lord shall he behold..." (Num.12:6-8).
"Then was the secret revealed unto Daniel in a night vision..." (Dan.2:19).
"...I will come to visions and revelations of the Lord." (II Cor.12:1)
Because the ghost and Scrooge are nearly seeing visions of the past and the people in those visions could not see them
Visions are an individual thing in most cases. Young Sioux boys customarily had their 'vision quest' to receive guidance for their lives. Probably the most well known Sioux vision can be found in the book 'Black Elk Speaks', which includes the holy man's personal visions and those for his nation.
The only way to get visions is in your dreams
Heroic Visions contains 280 pages.
Heroic Visions was created in 1983.
Visions of Cody was created in 1972.
Visions Electronics's population is 750.
Visions Electronics was created in 1981.
Love Visions was created in 2008.
Visions Of... was created on 2003-11-23.
Vicarious Visions was created in 1990.
The population of Vicarious Visions is 200.