3 Block Towers Poster

There are six possible towers with a red, blue and yellow block:

red on top, blue in the middle, yellow on the bottom

red on top, yellow in the middle, blue on the bottom

blue on top, yellow in the middle, red on the bottom

blue on top, red in the middle, yellow on the bottom

yellow on top, red in the middle, blue on the bottom

yellow on top, blue in the middle, red on the bottom

If you add a green block as well, there are 24 possibilities:

red, blue, yellow, green

red, blue, green, yellow

red, yellow, green, blue

red, yellow, blue, green

red, green, yellow, blue

red, green, blue, yellow

blue, yellow, green, red

blue, yellow, red, green

blue, green, yellow, red

blue, green, red, yellow

blue, red, yellow, green

blue, red, green, yellow

yellow, green, red, blue

yellow, green, blue, red

yellow, red, blue, green

yellow, red, green, blue

yellow, blue, green, red

yellow, blue, red, green

green, yellow, blue, red

green, yellow, red, blue

green, blue, red, yellow

green, blue, yellow, red

green, red, blue, yellow

green, red, yellow, blue