In order to produce a reasonably clear projected image the aperture has to be about 1 100th.
													
																	Upside down room drawing. 
									
	
		
	
																	There are many ways to master the art of drawing. 
																	For left handers with a horizonal image and a blank sheet of paper they can move sideways this would be the set up. 
																	A camera obscura device consists of a box tent or room with a small hole in one side. 
																	Light from an external scene passes through the hole and strikes a surface inside where the scene is reproduced inverted thus upside down and reversed left to right but with color and perspective preserved. 
															
													
									
	
		
	
																	Drawing upside down is a favorite method of mine because it trains your eyes to really see you examine the length of a line the curve in a line and distances from other lines it s an excellent practice to perform. 
																	For example the simple lion laying down figure 5. 
																	A brief intro to the upside down man drawing exercise. 
																	Sep 22 2014 explore sonal wasnikar s board upside down drawings on pinterest. 
															
													
									
	
		
	
																	A brief intro to the upside down man drawing exercise. 
																	This is also how you would use an envelope in conjunction with a horizontal image. 
																	We can trace use a grid or we can copy images from art books to name just a few.