Use of Sharp Lines and Bright Colours in Art

This gallery is a collection of 15 pieces of art where sharp lines are prominent and possibly meant to convey a message. These works are from all eras, dating back as far as 1912, to as recent as 2012.

This 3D piece is made up of household objects like pencils, matches, paper, wooden blocks, etc. The composition of this 'sculpture' piece is what's important, as they're all arranged with very sharp angles that create a distinct contrast with the bare white walls of the exhibition.
This painting (like a few others in this gallery) looks like the art style Cubism, but it's also Abstract, which makes it even more interesting, as the meaning is up for interpretation.
The lines between the shapes and masses in this one isn't as obvious as the others, but the bright colours still create a very noticeable contrasting between the shapes.
I really like this for many reasons, but mainly, it's the great use of tint and shade, along with the dark 'backdrop' and the sudden bright reds and oranges in the bottom to draw attention. The sharp line aspect is really obvious in this painting as well.
I'm a big fan of minimalism, and this one really stood out to me. The Archer looks like a modern digital design, maybe even a video game character. The use of the black shapes adds to the contrast and makes key areas 'pop' out more.
Much like an optical illusion, this painting requires a bit of staring time before you know exactly what's going on. There probably isn't another painting with more contrast than this one.
This painting uses a lot of complimentary colours to highlight each other. The soft, blended background allows the viewer to focus on the bright red and blue in the centre of the painting.
This is also another favourite of mine; The minimalism style reminds me of the game 'Portal', where the walls are made of shifting white panels. The dull ground, horizon, and sky compliment the bright white squares and dark sticks holding them up, creating a nice contrast.
The art style in this painting is very cartoon-like, and other pieces by this artist show close-ups of the characters, which look like intentionally deformed humans. The black outline, absence of lighting and shadows, and lack of a vanishing point help with the 2D cartoon style.
There may not be a lot of contrast in this seemingly dull painting, but the outlines are sharp and distinct despite the use of similar colours.
An abstract cubism piece, reminiscent of Picasso's Guitar, uses dull and dark colours and very sharp outlines, but a small splash of bright white to draw attention to the painting.
Another abstract cubism piece. What is it with this style and guitars (not that I'm complaining)? The colours in this are slightly more lively than "Seated Woman", and the blue definitely stand out here.
This very, very abstract painting is definitely not holding back on the crazy colours. Contrast is obvious here, and I'm sure the title ("Blue Rider") makes sense, I'm just not artistically talented enough to see it.
This painting resembles art styles from certain South American cultures. Once again, the black outline helps with the cartoon look. Despite the lack of shading I can still tell that this "fish" has a fin, and it even seems to be sticking out.
How can any collection be complete without some good old Vincent van Gogh. I've always been a big fan of his paintings, and this one shows contrast and outlines perfectly.
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