Centaur 
To dream of a centaur represents the two sides of the personality. You are attempting to find harmony between your emotional and physical attributes. The centaur also symbolizes intelligence, empathy, and civility.
Cheetah
To dream of a cheetah indicates that you need to motivate yourself and find the energy to chase your dreams. You have been letting opportunities pass you by. If you don't reach for them now, you may never have the chance again.
Glacier
To dream about a glacier indicates your unemotional feelings. You are closing down your emotions.
Grammar
To dream that you are studying grammar indicates that you are having trouble expressing your point of view or thoughts.
Gymnast
To dream of a gymnast represents intensity, poise, and flexibility. You are working towards your goals.
Harness
Harnesses are used to control or equip animals. To dream about a harness often reflects lack of freedom. You may be feeling restrained by your beliefs, and at times you feel others are holding you back.
History
To dream with historical themes suggests that you are subconsciously yearning to be in an earlier time. This may be related to past emotions or events, and may also indicate that you need to update your opinions and thinking. Enjoy living in the present.
Horizon
To dream of a horizon indicates the limitless potential of your life. It connotes the miracle in sunset, sunrise, birth, and death.