Exercise - Real and implied triangles

Triangles are not so difficult to find on a day to day life. They are the simplest and the most useful shape.
They are:
1) easy to construct
2) most basic of all geometric shapes having the least number of sides
3) being most dynamic due to diagonal and corners and stable provided that one side is a level base

Real:
a) a subject which is itself a triangle
The image below was taken from top of the train station which is a triangle in itself. It's part of the roof.


b) a triangle by perspective, converging towards the top of the frame
by tilting a camera up taking a photo of a building, it has created a triangle shape by perspective which can easily be done.


c) an inverted triangle by perspective converging towards the bottom of frame

This wasn't easy to start with. I was thinking of pointing the camera downward of a building (opposite of the converge triangle) but if I had to look downward of a building, it would have been quite scary!
Then I went walking around and suddenly look up the ceiling and found inverted triangle!!
This type of triangle, the reverse configuration, has different association: less stable, more aggressive, and contains more movement.

Implied:
this part of the exercise has been more difficult (to me!)
I google "still life" to see other people's works to give me some ideas what I could do with the stuff at home.

a) apex at the top
I have chosen 6 cups and stacked them all up with apex at the top.

I could have chosed 6 black cups with yellow background to creat colour contrast but unfortunately I only have 4 cups of black and 4 cups of white so to balance them, i have chosen 3 cups of each. Because the white cups are bigger, I placed them at the bottom.
I quite like the colour and the result.

b) apex at the bottom
the best way to take the invert triangle is to place a smallest item closer to the camera and place the rest behind. tilting the camera downward to see the small item being an apex at the bottom and the rest being the base at the top.

With the same background, I have chosen rednose comic relief smiley face, black cup and some pecks as my objects and arranged them as described above.

c) 3people making triagle

I can only do this exercise at work since I don't have enough people at home!
I asked three nice ladies to be my model. I did try a few posture and found this one the best in term of creating an implied triangle. The head of the lady standing in the back makes an apex of the triagle while the shoulders or heads of the two ladies sitting make the base of the triangle.