triangles create a sensation of activity and dynamism because they are made up of (at least two) diagonals. Even two sides can give the impression of a triangle. Triangle appear a lot naturally, but perspective also creates triangles as lines whizz off towards the vanishing point.
Real
1. Find a subject which is itself triangular (it can be in detail)
2. Make a triangle by perspective, converging towards the top of the frame
3. Make an inverted triangle, also by perspective, converging towards the bottom of the frame. You may need to think about this one
Implied
1. Make a still life arrangement of 5 or 6 objectives to produce a triangle with the apex at the top
2. Make a still-life arrangement as above, but so that the triangle is inverted, with the apex at the top
3. Arrange 3 people in a group picture in such a way that either their faces or the lines of their bodies make a triangle.
An implied triangle is made up of the darker middle of these purple flowers
There's a real triangle (actually a pyramid) here pointing up towards an implied triangle made from superman's legs
There are real triangle on the surface of the gherkin
This footpath has a number of triangles - both vertically and horizontally (especially to the right of the picture)
There's an implied triangle here between the tips of the shoes at the bottom of the picture and the bottom of the banana
And this mirror exhibit at the Psycho Building exhibition at the Hayward Gallery also contains a number of real triangle
