3D....4D....7D cinema...????

Get ready to digest hidden of 3D....4D....7D cinema...????Don't confuse the dimensions with length...it can be any parameter associated...!!!
# 3D is Visual...!!!
# 4D is Visual & Interactive
Not getting the meaning let me explain...3D rollercoaster ride where the chair tilts is 4D...!!!
Now guess 5D and 6D....what it be...????
# Will be ithink full immersion with surround screen so it is all around you with holographic characters that look like they are standing next to you...!!!
# Maybe with temperature fluctuations and the long anticipated smell-o-vision...!!!